Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c70ea0ccc8cc2a…

MALICIOUS

PDF

87.7 KB Created: 2021-03-15 22:26:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 91a4d73b64bbdf074e14b22289219924 SHA-1: 1e54b372b1dafe8ad0bab4b5dd6fdebf450edd86 SHA-256: e4c70ea0ccc8cc2a995a1e19bddd1d4182d324a8521fbc6be9b48efc70755a75
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 0.9997

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://dafemum.ru/123?utm_term=bajirao+singham+video+song PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456389/normal_6030f55110a33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385417/normal_5fda7a74061c3.pdfIn PDF document text
    • http://rte-ita.fun/xazaxazavabelelafalofsz5o.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/igTghjh/classic_car_racing_game_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/vawapisoxe/y8jdtZy/dunkin_donuts_near_me_prices.pdfIn PDF document text
    • https://cdn.sqhk.co/bozutebux/gktgi0O/sukuwimesexeruberis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456134/normal_601a61af7e897.pdfIn PDF document text
    • https://cdn.sqhk.co/gimovitax/JhbtSsS/rajunajunuba.pdfIn PDF document text
    • http://basiditdcf.space/android_studio_sdk_linux81ymq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367656/normal_5fd2438763a33.pdfIn PDF document text
    • https://cdn.sqhk.co/zeterabaxax/7iehfXr/transmission_efficiency_definition_physics.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7a69a04d-b0b3-478e-a927-895b34d3dd44.filesusr.com/ugd/159848_3ba33ea9e075499a9bf312c78cbc5917.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9bcb51c-7d0b-4306-bb77-70714e617cc3/the_five_dysfunctions_of_a_team_assessment_questions.pdfIn PDF document text
    • https://30c74dc1-c3f2-4e71-8253-1ec84f3b94e1.filesusr.com/ugd/b8c6fa_36b8cee39fca46a585b28414d6efcb6b.pdf?index=trueIn PDF document text
    • https://48b7024d-7414-4593-b44d-ed892b96ad15.filesusr.com/ugd/3e5db3_268dd31751bb475fbc2807047b7d0350.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f00cfb3c-e6ff-4e83-8a5e-e1fcea0b42e3/6924136663.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25f30814-c886-4bbf-9cb2-5040a1867cea/fajujugujuxaremizijivara.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10436 5392 bytes
SHA-256: 8bb5e1a02cf357d89e704de572ba3005aeb99412b4ea43112ec581eee988d6f1
font_01_sfnt_off0001166e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166E 11096 bytes
SHA-256: 6964c6029766e80a7c0cd357b5d0070a8fcd7856b2b4ccca7b84c3f06d776237
font_02_sfnt_off00013c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C8A 16164 bytes
SHA-256: 6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3

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