Malicious PDF — malware analysis report

Static analysis result for SHA-256 a154293b585aed3e…

MALICIOUS

PDF

102.0 KB Created: 2021-03-09 03:04:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ef7d9225f9f5e42cbf5146839f454a0c SHA-1: 15e6b834899a05b1c7840da1e49ea222e1e7f904 SHA-256: a154293b585aed3e3827a57f9544f690a7cdd699fbddbfe61733ce2e6d20a847
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 6

  • 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 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://pelibifir.ru/123?utm_term=systems+approach+to+industrial+relations+pdf PDF link annotation
    • http://bloodcraft.online/parepisimute9ucah.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463308/normal_600eaa3942021.pdfIn PDF document text
    • https://xebutikud.weebly.com/uploads/1/3/0/8/130813588/jodabajobig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449422/normal_6041c58f16ac3.pdfIn PDF document text
    • https://cdn.sqhk.co/zovaratigu/Yviifsp/lock_screen_wallpaper_android_code.pdfIn PDF document text
    • https://fewegako.weebly.com/uploads/1/3/1/4/131453302/dakim.pdfIn PDF document text
    • https://cdn.sqhk.co/nalujujoso/m1uhbgg/artillerists_mod_apk_1._1._12.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/gwgdQ9s/lafibupemewakaso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449777/normal_603ffc4feb4d1.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/gobuwi.pdfIn PDF document text
    • https://cdn.sqhk.co/medujebukoma/ejgijIl/kohls_30_online_discount_code.pdfIn PDF document text
    • http://golden-bridge.pro/4868416264a3wkd.pdfIn PDF document text
    • http://loveworld.club/understanding_economics_mcgraw_hillnj325.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/jf3hiic/tap_build_tap_titans_2.pdfIn PDF document text
    • http://50offstore.pro/vixogixukegewobagazuraf56pt.pdfIn PDF document text
    • https://xonaxogurevof.weebly.com/uploads/1/3/1/4/131453171/pesibis.pdfIn PDF document text
    • https://cdn.sqhk.co/gufojakig/sNphcgc/the_good_place_podcast_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/purilusevike/iawfoje/85065719221.pdfIn PDF document text
    • https://bileravufal.weebly.com/uploads/1/3/4/7/134749654/b345ef7b2ba574.pdfIn PDF document text
    • https://cdn.sqhk.co/maxanogefo/jRwieig/14283724997.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417990/normal_6001934201e5d.pdfIn PDF document text
    • http://winoraama.site/98969791504k7czm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tumasun/tovelipufamunamuveva.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/sat_practice_test_4_curve.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/math_standard_and_expanded_form_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/47040702860.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/chalte_chalte_old_song_remix.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_off00011780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11780 16532 bytes
SHA-256: 0866ca834608569a8f033cdbc1cd41045362bacb4bda250d0f12e49cd8b18ed9
font_01_sfnt_off00014c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C4C 5600 bytes
SHA-256: c4a77949fc80e9e949cf97c011ac64915231400e610858ca0fbe751fd97f0560
font_02_sfnt_off00015f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F33 12656 bytes
SHA-256: 14c620b489ddd551ae64ad1d73cfd93064e9fb56d5264eb07f2e00ea8f990b97

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