Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a60efec8ba94c8…

MALICIOUS

PDF

75.1 KB Created: 2021-01-08 15:42:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5b9733064c1675a8c5c79e40ec51c504 SHA-1: 65e5730c54827c241d48bca772ab8d34a5813f79 SHA-256: c7a60efec8ba94c8b3f837447de246a5dcc03faed50f2180e9139db31e142737
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/aws?utm_term=mainframe+interview+questions+and+answers PDF link annotation
    • https://cdn.sqhk.co/xogiwusumo/hbYDbig/ejen_ali_emergency_mod_apk_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/dOlDAjh/is_my_bowling_ball_dead.pdfIn PDF document text
    • https://pufemomanuxisi.weebly.com/uploads/1/3/4/3/134344256/6751164.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466154/normal_5fd073ae7abae.pdfIn PDF document text
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/masiponufoxiv_fukuw_tanibipolif_rotoxego.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393626/normal_5fc029968a397.pdfIn PDF document text
    • https://cdn.sqhk.co/rewazexi/EribhcF/zombie_hunter_sniper_apocalypse_apk_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426675/normal_5fbd99ef41596.pdfIn PDF document text
    • https://pamaridefudeluz.weebly.com/uploads/1/3/0/7/130776324/6285777.pdfIn PDF document text
    • https://lezunodukulo.weebly.com/uploads/1/3/4/3/134341823/8429548.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/7ea7ed05-c28d-4905-a1bd-5e8c547c6a21/nisobekapejirigo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63c8941d-f887-4fd2-afce-2cd5822dd84b/64575480337.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3333b3c2-ea35-4f92-86de-69b712c1c511/34129906473.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf74dca5-b745-4f9e-b45e-fd1b54e27356/44562447373.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f243394a-1bc2-4885-8eeb-707fe9da3397/40884380577.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_off0000e9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D2 5304 bytes
SHA-256: 9c05c180d421f024e288f7b9a88d5e1590110151ba39e5b393446f4cc51561a6
font_01_sfnt_off0000fbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE9 10348 bytes
SHA-256: 6a69d8cab8284fb38bcf1f72af71ac5b658e63d15b11b518e130199852a1bced

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