Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d8a9a380144405…

MALICIOUS

PDF

78.2 KB Created: 2021-03-13 23:55:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: c5ebc6c2ff2d7851930707fe0596445b SHA-1: 27c85ea580d083ab180c3820a8207a19247fb6bb SHA-256: 84d8a9a3801444059210b5d1bcf60748d0039786af21f9b607f2a1a191d1990d
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains and configured with UTM parameters, indicating a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=harbor+breeze+ceiling+fan+remote+receiver+replacement PDF link annotation
    • https://surevasod.weebly.com/uploads/1/3/1/8/131856145/568f6a7.pdfIn PDF document text
    • https://falopizesolirod.weebly.com/uploads/1/3/1/3/131379111/7248932.pdfIn PDF document text
    • https://retetozatinum.weebly.com/uploads/1/3/0/7/130775023/soxufotilubow.pdfIn PDF document text
    • http://coolvdomaion.online/teachers_assistant_pay_ratenslj6.pdfIn PDF document text
    • http://sandwichhq.club/38594275747hmqhs.pdfIn PDF document text
    • http://tesar-krd.ru/97842492694w0nsg.pdfIn PDF document text
    • http://solapp.xyz/do_amazon_employees_get_discounts_on_apple_productsclkb7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373520/normal_5febc3047b91e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463543/normal_604a50045d63b.pdfIn PDF document text
    • https://gimitowogavu.weebly.com/uploads/1/3/4/7/134746983/5b76acd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_d0bac07084f1402891cf8ad6ead3367b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/paxunu/75786407358.pdfIn PDF document text
    • https://af8e4364-7f8a-45ec-af3e-d69da1c27fbb.filesusr.com/ugd/12c36c_54474aa64a11420eaf1ee6e7f4084e71.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/92ee676f-010e-45f5-9f08-36ada04d94e7/92058870353.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/auxiliary_verb_list_with_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eccfd0b1-d031-4399-8417-6a82d026256e/5317127884.pdfIn PDF document text
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_ebe1f03d1b9b4dd89701ab252b7ad348.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/95a6b7fd-d5e4-41f4-b458-d61fd99ee968/the_lathe_of_heaven_movie_2002.pdfIn 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_off0000eeeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEB 5368 bytes
SHA-256: 072796359725fd3af52037f979337667a96e3d76bd59af839d7e5bed960925cd
font_01_sfnt_off0001012b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012B 11872 bytes
SHA-256: 163aaf64ed8565f8a2fd96f34d0e0ed0d02bfb66f5baf1af4daca079953d2972

Open this report in the interactive analyzer, or submit your own file for analysis.