Malicious PDF — malware analysis report

Static analysis result for SHA-256 b92aa1234f0f45e3…

MALICIOUS

PDF

79.7 KB Created: 2021-03-27 12:06:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09fc8ee14db577fc07720309ac69baed SHA-1: 9a75507f5b71cb1deb93ec45c31dc28c2deeda92 SHA-256: b92aa1234f0f45e3a56955a6f56382d0948062e6e9ea266b8997eb90f5fe861d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it functions as a link farm for SEO manipulation, likely to distribute further malware or phish users. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern. No scripts were extracted, but the structure and heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/strik?utm_term=what+is+the+hcg+protocol
    • https://cdn.sqhk.co/nasanoroge/jjIieJj/wifi_software_for_android_tablet.pdf
    • http://fuxanujibiz.mygamesonline.org/union_budget_2020_highlights_bankers_adda.pdf
    • http://kugewezebuvigiw.mygamesonline.org/xevejopetetifizojabemidem.pdf
    • https://cdn.sqhk.co/vedasukuki/iaShbgi/31208819879.pdf
    • https://lurenosofen.weebly.com/uploads/1/3/0/7/130740325/aa20ac947.pdf
    • http://witikotuxigere.scienceontheweb.net/dinovosugana.pdf
    • https://rijojuno.weebly.com/uploads/1/3/5/3/135310883/botibagida.pdf
    • https://woxarupuxanuma.weebly.com/uploads/1/3/1/3/131383908/fajalinosasixuneja.pdf
    • https://cdn.sqhk.co/tavanaru/hgc9nia/mobomumiwaguzo.pdf
    • https://tinutenuku.weebly.com/uploads/1/3/4/6/134664278/zuginevezaxagafi.pdf
    • https://cdn.sqhk.co/bebomopakax/arx2n1n/business_strategy_2_apk_hile.pdf
    • https://cdn.sqhk.co/vijukifezu/5jhXghU/speedball_opaque_fabric_screen_printing_ink_starter_set.pdf
    • https://cdn.sqhk.co/jukowejazus/f17pd8c/drum_kit_parts_diagram.pdf
    • https://cdn.sqhk.co/rixutixim/D6ijh5j/68602919640.pdf
    • https://geworusidexaj.weebly.com/uploads/1/3/5/3/135306562/78578f74d.pdf
    • https://cdn.sqhk.co/naziwixolagu/hhcbNhe/pupps_rash_pregnancy.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8b0478b1-f8d0-47ca-8a63-91032d555548/guided_imagery_script_forest.pdf
    • https://uploads.strikinglycdn.com/files/646f5c00-ec78-471d-a772-e3324520d048/76655424575.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8b5.bin
da14c8dc922f09b7169be786d3403bf135018ac449b6facb8c62bb87828d898e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B5 5208 bytes
font_01_sfnt_off00010a7a.bin
60fb187fc76b1237cb5592cc56576208e764055c8a5a533e6be18539126813dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7A 11000 bytes

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