Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e970bd6c98b759a…

MALICIOUS

PDF

88.4 KB Created: 2021-06-12 15:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7aa11a1a7e6626d560b29ae135dd9469 SHA-1: 271424ed95b86dcc9339144664a99865a049a949 SHA-256: 2e970bd6c98b759a30740096aaeb4e2e7a44532b97a3f5adf4bd157966c9aa7c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9993

Heuristics 5

  • 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 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://synerhu.ru/pbw?utm_term=stardew+valley+pomegranate+id PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406787/normal_60159510260f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374956/normal_603cf12e58ad1.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4366654/normal_60b50c263bf35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392867/normal_60bf3c7a8932c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388626/normal_60351c46c804c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495686/normal_6004d3a681fbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393018/normal_603934a073527.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366014/normal_600704065e000.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482625/normal_5fec992e5f539.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448719/normal_60498b7d24e3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501201/normal_601183bdbb694.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/83d55f26-9ca4-4398-b7f9-6cf70fe6ad53/is_red_heart_yarn_made_in_china.pdfIn PDF document text
    • http://juvupumanut.pbworks.com/f/turoraminesowa.pdfIn PDF document text
    • http://tefimemovem.pbworks.com/f/87269302179.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fd26cd3-2590-4732-99dd-8eb43a1d66e8/47763478135.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/579d7b28-912a-42f7-939d-08b4490228c0/fimaxunot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94ab44ac-64eb-4e13-a124-6dc0d1136a8c/melunabedepemotadap.pdfIn PDF document text
    • http://metudebebi.pbworks.com/f/pukuvowadek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eca3c833-5037-45c4-935f-bb10d4ef6d03/roblox_mod_apk_2020_unlimited_robux_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53968840-f26e-4d1f-86b8-a373a10fac58/3333977643.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d40e1968-53d8-4850-af66-c0b93f2ffa7c/2444002981.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df2cb9ee-e3cd-471a-9462-cee2e93d37bf/vegetarian_recipes_for_kids_lunch_box.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea53be26-9a05-4d1e-ae56-99df9105cda6/rebuxizumomirizamofejep.pdfIn PDF document text
    • http://pewamez.pbworks.com/w/file/fetch/145130094/best_video_calling_app_for_pc.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_off00011b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B20 5460 bytes
SHA-256: 2442be6d5cea119a2250886ce5d20bf6d59c9d947a6c5bb989330f0bcaec6700
font_01_sfnt_off00012db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB7 10820 bytes
SHA-256: 810f7d9be8506a8e1d554d03f6169ee2f463e6818e07e084196b09e2ea06b851

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