Malicious PDF — malware analysis report

Static analysis result for SHA-256 91715d0c54350cc8…

MALICIOUS

PDF

68.0 KB Created: 2021-06-06 11:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1dd0a0b75f3d7aa77234df2dfd31bfcc SHA-1: 40b75c1283131c7d18594946a656933772e27446 SHA-256: 91715d0c54350cc832dcdbc5f187bd5bb5d1f28149dd7309adca10908c7e48ef
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm designed to redirect users to external sites, with one heuristic specifically identifying it as a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is intended to lead users to malicious content, likely through a phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://allytemp.ru/pbw?utm_term=lg+g+pad+x+8.0+v520+caracteristicas PDF link annotation
    • https://dadotetixaj.weebly.com/uploads/1/3/4/4/134404583/8c63199622e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401691/normal_6056fac4b47d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388413/normal_5ff2bee62ac99.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4450624/normal_60b461262cc1c.pdfIn PDF document text
    • https://sesupukaxupasi.weebly.com/uploads/1/3/1/0/131070911/vibulopokagi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415055/normal_605372f28778b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413718/normal_606c9d97bfcee.pdfIn PDF document text
    • https://bijupodenu.weebly.com/uploads/1/3/4/8/134894051/0c771.pdfIn PDF document text
    • https://mumizovis.weebly.com/uploads/1/3/4/3/134350635/tunodofe-xasojavere-tupevixepixeriw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401982/normal_60420438c845e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454045/normal_60490d0898981.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421473/normal_6050da8038e7c.pdfIn PDF document text
    • https://bupimapigi.weebly.com/uploads/1/3/1/3/131383283/9274275.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sozakuvepar.pbworks.com/f/56441422155.pdfIn PDF document text
    • http://xuwedateredu.pbworks.com/w/file/fetch/144605646/procs_verbal_assemble_gnrale_constitutive_association_loi_1901.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a87991e-c982-4264-859d-e9892405a325/mobuwil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccca2c36-eed2-482e-80a0-c13366dc4806/how_long_is_a_scag_turf_tiger_2.pdfIn PDF document text
    • http://zekodunu.pbworks.com/f/gavasemib.pdfIn PDF document text
    • http://xosufixemuf.pbworks.com/f/aaron_berkowitz_clinical_pathophysiology_made_ridiculously_simple.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a13aa18-4f8b-465b-96b9-4915deeb9cd6/95425613826.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_off0000c888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC888 5904 bytes
SHA-256: 7327ac61a60cb0737c470126a26dcc12ca2fbfc6d8735440ad68cd52c75bbe00
font_01_sfnt_off0000dcc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC3 11024 bytes
SHA-256: d333a8dfc8a5a76fd9c4f0ba36c8857df927ac7563d6b3e2fa56f64539853e63