Malicious PDF — malware analysis report

Static analysis result for SHA-256 54a7266751c50329…

MALICIOUS

PDF

120.5 KB Created: 2021-03-16 13:34:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 182c1df278c2ed2607f51d05da8f5287 SHA-1: 9c1bbf2efc7c3a3c8ce3689077f56f4bcad8186e SHA-256: 54a7266751c50329533a80ee1ddb1c07491b4904f831377e874cf190ff50fa63
254 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on disposable domains or redirectors, indicating a link farm designed to obscure the final destination. The critical heuristic 'SE_BRAND_CREDENTIAL_PHISH' specifically identifies a credential phishing lure impersonating Microsoft, pointing to a malicious PDF hosted on a Weebly subdomain. The ML classifier also strongly flags this PDF as malicious. While no scripts were explicitly extracted, the nature of the link farm and the phishing lure suggest an attempt to download and execute further malicious content or redirect users to credential harvesting pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 8

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://gimezoribetigaw.weebly.com/uploads/1/3/4/6/134676461/xuzukit.pdf.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://leonvi.ru/strik?utm_term=american+politics+today+textbook+pdf PDF link annotation
    • https://cdn.sqhk.co/xizemeginu/ohdhjg9/conversion_sheet_for_math_grade_5.pdfIn PDF document text
    • https://cdn.sqhk.co/sawapevodef/hahuKhh/pofajuxirezasukobota.pdfIn PDF document text
    • https://cdn.sqhk.co/letabuner/mjfM8Je/diziviruresitimolonoras.pdfIn PDF document text
    • http://dororuminaxa.mywebcommunity.org/nedelonodegufe.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/bykhfjc/renutedabek.pdfIn PDF document text
    • https://gimezoribetigaw.weebly.com/uploads/1/3/4/6/134676461/xuzukit.pdfIn PDF document text
    • https://cdn.sqhk.co/nogorodizet/jdib3jb/gukepamobimipimo.pdfIn PDF document text
    • https://wenewosu.weebly.com/uploads/1/3/4/2/134266389/ca5a8d9d.pdfIn PDF document text
    • https://tugalebuwe.weebly.com/uploads/1/3/4/0/134012885/sadoduzota-kopimanotesefa-paragoxi-jakalikuv.pdfIn PDF document text
    • https://cdn.sqhk.co/novupezezis/eqiiHNv/hide_and_seek_song_imogen_heap.pdfIn PDF document text
    • https://cdn.sqhk.co/susojareb/WifwI1W/38758184986.pdfIn PDF document text
    • https://cdn.sqhk.co/bilanogakiw/fnsgjhf/calligraphy_font_free_for_mac.pdfIn PDF document text
    • http://pazefezos.mywebcommunity.org/public_relations_specialist_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/tolademapati/bmXgdjj/70434859008.pdfIn PDF document text
    • http://jarevine.mywebcommunity.org/82971121008.pdfIn PDF document text
    • http://gapagal.mywebcommunity.org/27902954618.pdfIn PDF document text
    • https://cdn.sqhk.co/vedimofaw/6haighb/warpath_bowling_lanes_kingsport_tn_prices.pdfIn PDF document text
    • http://nakozek.mypressonline.com/64778914503.pdfIn PDF document text
    • https://lepopitiw.weebly.com/uploads/1/3/4/7/134762721/gelewanurogivide.pdfIn PDF document text
    • http://fikosarodone.medianewsonline.com/camino_primitivo_gronze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tofilijewok.atwebpages.com/52195460490.pdfIn PDF document text
    • http://kuwitabetegipo.myartsonline.com/63945682574.pdfIn PDF document text
    • http://saxodanokijaj.atwebpages.com/53066813328.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_off000198f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198F7 5664 bytes
SHA-256: 08f8ee05f761826836835c06ba3c6b615291ac1dc5f210d56751bde821612625
font_01_sfnt_off0001ac34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC34 11752 bytes
SHA-256: 5aaea5d68eda9d40db7802845f76e8abf21af2df364ca5c0a978d701b929f385

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