Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad4337fae5a6f9f2…

MALICIOUS

PDF

87.5 KB Created: 2021-03-20 21:25:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3d21b48feb9e2bedae77aefe5eea1ecb SHA-1: 9fd312be68669f7f0f98cdc3cfd676cfcdd61c37 SHA-256: ad4337fae5a6f9f2aeb8dcc1c1d881008fd6f183436365f5d04932326f7b1ff2
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 0.9994

Heuristics 5

  • 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 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://xajibur.ru/wix?keyword=how+to+study+for+science+olympiad PDF link annotation
    • http://rankingcoach-seo.com/jekigogowefitoloub4yo.pdfIn PDF document text
    • http://calipshatngaccs1.xyz/zenubodoralibatixokoponrxyu.pdfIn PDF document text
    • http://hookup157.online/empower_c1_download2zwp6.pdfIn PDF document text
    • http://watertea.space/convert_xfdl_tohyool.pdfIn PDF document text
    • http://uorott.com/napuxajolelasokukelusebapfsti1.pdfIn PDF document text
    • http://ndfnasg.xyz/rekovafidux6rri9.pdfIn PDF document text
    • http://hightrade.club/la_gallina_degollada_horacio_quiroga_resumenw8iak.pdfIn PDF document text
    • http://swiss-family.space/brainstorm_app_iphonep6kct.pdfIn PDF document text
    • http://fresh-ita.fun/watch_pixel_online_free_megavideomwfbw.pdfIn PDF document text
    • http://rodina38.ru/355709106979n7ui.pdfIn PDF document text
    • http://aycotoro7.xyz/first_30_60_90_days_in_a_new_job_templatevzxes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kumasala/agneepath_all_songs_320kbps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43d6cd7a-2247-4f4f-9668-f54de4c05a61/how_fast_is_a_rzr_170.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7753e7ec-276c-48c9-821b-6293e203a341/clarity_xlc3.4_batteries.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/winumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6b12205-3bc3-4c4d-b47b-382562c6be38/lomezowele.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e5e2cea-233b-415d-bc51-02b2749e9db2/final_fantasy_xv_review_no_spoilers.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/magnetic_current_formula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51299363-8fd3-43e0-923d-f08bd93b4fd1/bagasedi.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/nj_drivers_permit_practice_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a65692eb-8d88-4e51-bd96-bb2dcefa2708/punuzowekodeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74605a38-7397-4b43-b859-94b73d585377/10567947761.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC2 5340 bytes
SHA-256: 467338a4e78f0a6215493af47b7f6455742fe6935a846e474bb2b3f75f420b77
font_01_sfnt_off00011dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD8 10760 bytes
SHA-256: 4550732b68ae8fd292724680e965a033c4498eb5dfc65f743c65154991501e54
font_02_sfnt_off00014290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14290 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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