Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f5c495e7351a83b…

MALICIOUS

PDF

78.6 KB Created: 2021-06-12 20:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d7fafb01fb02bcff3715465556f18bd5 SHA-1: c44baa73a75015f208b241b97a1bd1ffe93483bb SHA-256: 6f5c495e7351a83b077d9c05273ec2753af1e2d5214fd27d71428b7f85015a18
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and link farm heuristic point towards an attempt to redirect users to malicious content.

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://pistant.ru/pbw?utm_term=christmas+travelers+crossword PDF link annotation
    • https://sosojisizavawov.weebly.com/uploads/1/3/1/4/131454692/8f0ce1b96.pdfIn PDF document text
    • https://wotipufa.weebly.com/uploads/1/3/1/0/131069738/rumiwidogededos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467581/normal_6058c0e43594d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482230/normal_602e786a0fb34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393635/normal_605676532c74e.pdfIn PDF document text
    • https://zamovolipizutuj.weebly.com/uploads/1/3/1/0/131070940/3629773.pdfIn PDF document text
    • https://wigowaziralo.weebly.com/uploads/1/3/4/4/134498628/2974570.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6bc4976-7178-41de-b039-6ced04fdd8b4/how_much_is_alan_rickman_worth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5cef46a-8696-44ee-b160-b5c8056d2365/fortune_bracelet_meaning.pdfIn PDF document text
    • http://sawebaz.pbworks.com/w/file/fetch/145186212/36102785775.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2e77d4e-871d-413f-9400-2e4bc1f74705/xopuxaxuzuxaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00930bf2-2711-45b9-8ad5-50146a2d82d4/87760326763.pdfIn PDF document text
    • http://welomobo.pbworks.com/w/file/fetch/144604053/55081101814.pdfIn PDF document text
    • http://xifatarege.pbworks.com/w/file/fetch/144684567/algebra_1_arithmetic_and_geometric_sequences_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d10eab50-ed26-4d28-b301-dc3e4dbf579d/using_the_periodic_table_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f18ce252-1e3f-419b-a7ec-0d67d0500471/9214327051.pdfIn PDF document text
    • http://fifekapem.pbworks.com/f/faded_karaoke_mp3_download.pdfIn PDF document text
    • http://vinukena.pbworks.com/f/18_wheeler_truck_games_unblocked.pdfIn PDF document text
    • http://kigiputilik.pbworks.com/w/file/fetch/144733743/19952026069.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/175bd581-8776-4853-8810-02ba117d51f7/85317510303.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_off0000f5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D8 5236 bytes
SHA-256: 85d551791ed18a9f62282dfb5330ecabcb43f1f427d63720131c2ea502cfa414
font_01_sfnt_off00010782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10782 11136 bytes
SHA-256: 3d108dc8ca4ba8a59b8787802ac1df90ac5a98cf0abfd61c425b2984d48cd79d