Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf110d91e92c73e…

MALICIOUS

PDF

80.6 KB Created: 2021-03-17 14:08:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 43a9345c89ab7cc6e511fd3b08b0d01b SHA-1: 9da8da3df284c133755047978c228c38e826bfaa SHA-256: 5cf110d91e92c73e61109669dc23ee7b75e994bad850df8f1141ce84835d15fa
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 0.9998

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://crophysi.ru/wix?keyword=grinding+it+out+the+making+of+mcdonald%2527s+free+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409396/normal_60114493b48d0.pdfIn PDF document text
    • https://cdn.sqhk.co/tedubifo/iIhggh6/maze_prison_escape_book.pdfIn PDF document text
    • https://cdn.sqhk.co/jopuromug/dbyjbij/zobadake.pdfIn PDF document text
    • http://vomidujoma.scienceontheweb.net/65312952821.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481675/normal_5fd657d00a451.pdfIn PDF document text
    • https://cdn.sqhk.co/zimajigon/bjeje7x/buddy_toss_mod_apk_iphone.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/ce7030f2-83ea-4cd6-a60b-3d495a30067f/boxoxuremabewu.pdfIn PDF document text
    • https://04a9e765-cf69-4035-9b9a-998d8fb4e692.filesusr.com/ugd/8c5016_62f9d8b7e4de495799964c8d186cd562.pdf?index=trueIn PDF document text
    • http://nejimafalun.onlinewebshop.net/serazebota.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3511454f-2e3f-4f1f-a2ed-b6d1a21e0425/how_to_login_to_ms_project_online.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/please_confirm_if_the_information_is_correct.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9568605-52c0-4b68-a723-aa056f9a6370/lananenufoxumat.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/fortnite_season_4_week_10_challenges_guide.pdfIn PDF document text
    • https://dd39d194-9042-494f-90ab-223c96cf8da5.filesusr.com/ugd/5d3909_216f0a1461534d319525061d5b72f0ab.pdf?index=trueIn PDF document text
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_bf546876042a41dbb840067e04343dcb.pdf?index=trueIn 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_off0000e2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AD 5696 bytes
SHA-256: aebdd15cb4036447f4164c6f4992348b527e35adc72c7e612785d81f99dcd77d
font_01_sfnt_off0000f5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F6 12076 bytes
SHA-256: 1c9ff411d8f5769917ed5541c2ad7e22ff2f0a91d4bd978e5e69208f4fde7f5b
font_02_sfnt_off00011d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D76 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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