Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc37873635587223…

MALICIOUS

PDF

72.4 KB Created: 2021-03-23 00:38:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: fea989e23a21b9b2dbddc73734f2a300 SHA-1: 2a72f1e20f62ae0b7918712265a4f4e14d796263 SHA-256: fc37873635587223be67db96184a876194315d4dec9cc99eaccc6c611f26b755
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many pointing to disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure, aligning with Spearphishing Attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gimoguvi.ru/aws?utm_term=al+fajr+clock+dst+setting PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490369/normal_602f34ebe88d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423188/normal_5fc8b255b8127.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388416/normal_602c96da2f191.pdfIn PDF document text
    • https://fukagopesuzidad.weebly.com/uploads/1/3/1/3/131381553/7082716.pdfIn PDF document text
    • https://xififaxapid.weebly.com/uploads/1/3/4/3/134344339/470315d77c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421213/normal_6039c65689a88.pdfIn PDF document text
    • https://rakafofolobe.weebly.com/uploads/1/3/4/6/134649319/9f4a5336c22ec3.pdfIn PDF document text
    • https://zeruxukekojumu.weebly.com/uploads/1/3/5/3/135345771/vojotitezoxi.pdfIn PDF document text
    • https://kobexozabegubom.weebly.com/uploads/1/3/3/9/133999893/tuzafukomub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487431/normal_5fe373f0c3453.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://09235f31-469a-4613-94fc-36d04c1f642a.filesusr.com/ugd/8b6407_1173fec0102148b78b8968072673e11b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac7a3b06-76c3-4fe6-ac80-afab55fc7a79/the_rules_of_the_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffb10311-09ad-4854-8200-af87e5cb3484/how_to_make_a_scatter_plot_diagram_in_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe9dca9b-0615-48cd-ad5a-cc134ac75112/betty_crockers_good_and_easy_cookbook_first_edition_1954.pdfIn PDF document text
    • https://bea00909-aa88-4d38-ac88-e56db460b486.filesusr.com/ugd/923104_32757ff381124f4da41803c17dd5a3a6.pdf?index=trueIn PDF document text
    • https://203aa715-7352-46b1-b16b-5d0aeeaa27a2.filesusr.com/ugd/0582e0_e044f3f32b554a83b254d86fa6b5aeb9.pdf?index=trueIn PDF document text
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_e16bec118d544b408214005391d314b4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ac54b5b-66b2-4a0c-a35f-0e455560fd67/who_is_playing_ariel_in_the_little_mermaid_2020.pdfIn PDF document text
    • https://ad646471-8556-449a-8150-55a6f6ff724f.filesusr.com/ugd/7a1c5b_5e0abce698324377948c9bcf7f226549.pdf?index=trueIn PDF document text
    • https://d19688e0-347f-4d9d-8cb3-d47c6e049f3d.filesusr.com/ugd/c618e9_dc8f99a9eff9477e8305b13d8c157d1d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9278ad8c-7638-4edf-828b-8c14620b5d1b/jeziboxojeparefojituni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b2a7cc7-bec8-4a72-b44e-f58b9b3b0bb3/how_to_replace_fisher_and_paykel_dryer_door.pdfIn PDF document text
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_f2ca27d880204637b7a17c7e4d648ca0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/637d90d3-b40f-4961-8df0-0b85ee083477/vafabarivadofewekobijiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48079528-2782-442d-86ca-400e4d8dc9c4/panasonic_phone_manuals_kx-dt343.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7979170e-67fa-4226-a459-703d9db6a7e5/basic_geometry_terms_crossword_puzzle_answers.pdfIn PDF document text
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_6e940483a6f0489d8aee908efd58f722.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE0 5320 bytes
SHA-256: 4af38d08f6ed170db1523e813ce8a4c78f0ca97c42bdc02d2efe8092ca8a1f67
font_01_sfnt_off0000ee0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0B 10820 bytes
SHA-256: 8aa24cffc152a587977a4e6b2c1cb1b4c2a6f6f3c58974d7fb31968d1dd67061