Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf69f7483dd725c7…

MALICIOUS

PDF

79.7 KB Created: 2021-03-09 16:10:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 212d15f5716fa69c3fe022de67955a84 SHA-1: 5d41961c2a7e48139ea40d7a92f209c6f638cd11 SHA-256: cf69f7483dd725c7447030faaf6f7e5e24e029e833e0be71595c38174e63bcf5
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URLs pointing to other PDFs, likely for SEO manipulation or to host phishing content. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest this document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://baarspo.ru/aws?utm_term=calories+dunkin+donuts+chai+latte+skim+milk PDF link annotation
    • https://guzajemifuraruv.weebly.com/uploads/1/3/0/8/130874286/0013f.pdfIn PDF document text
    • http://lunagogafoxoj.sportsontheweb.net/rose_petit_prince_symbolique.pdfIn PDF document text
    • https://cdn.sqhk.co/vojofarakiva/gdhgghe/nalakagotodona.pdfIn PDF document text
    • https://ledapenilodaro.weebly.com/uploads/1/3/1/0/131070651/busoroxujemafenunik.pdfIn PDF document text
    • https://zokelafeg.weebly.com/uploads/1/3/4/8/134889419/8056366.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/dibRCvs/jowisidu.pdfIn PDF document text
    • https://cdn.sqhk.co/saseponirifa/agcRfjb/oneplus_6t_native_video_calling.pdfIn PDF document text
    • https://zoseduzarososu.weebly.com/uploads/1/3/2/7/132740870/8258066.pdfIn PDF document text
    • https://dajikapepexav.weebly.com/uploads/1/3/4/5/134597014/jusagigowavut.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://44f39d5c-a655-4437-91b6-62b11e148e71.filesusr.com/ugd/eb4c03_1c73f9480f134862a9ced226be2e7121.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/adf50f6f-2c67-4928-a301-d4ae5f00594b/61402610237.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/61985447993.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b06c9791-afdf-4bcd-8370-4f24fa529655/interior_decorator_jobs_near_me.pdfIn PDF document text
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_6518d107f9b646c7ad1ab931b29a7bf4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a63f54db-e1e6-4def-a19a-cf1e2cd4c07e/fubolotaxogituti.pdfIn PDF document text
    • http://femagela.myartsonline.com/7619647692.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/bioscopewala_movie_filmywap.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/94494687664.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/lejuvimumewako.pdfIn PDF document text
    • https://f495c71d-628d-4070-9a3d-b699cbb46ba4.filesusr.com/ugd/d99ef3_846bf17c37d344e28ac0e16b30c223e8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ad38146-c153-4860-a53d-6b7dc9f3b542/le_petit_prince_symbolisme_rose.pdfIn PDF document text
    • https://6776ac3f-883f-499f-bc52-38dff818ec46.filesusr.com/ugd/969751_c77fbe413cb04deab427afe9b838bd96.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3eec2311-e4b0-447b-836f-57d94f146723/best_replacement_battery_for_samsung_s4_mini.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_off0000f101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF101 5148 bytes
SHA-256: c7cf7a54929ba51896f585fed06c6ec3614c209f7ea6874e8a99627a3f796d69
font_01_sfnt_off0001024d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024D 1940 bytes
SHA-256: c5826c68d5841b739a4cef6a355105b0a64a7eaca563b864f03d3242b29b72c3
font_02_sfnt_off00010b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B85 10948 bytes
SHA-256: d33d924ed3f017b951cb577a1f8441c19670ef9dd6fd2179fa45c2e6a3288948

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