Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c9fbdfc2dcf1e3f…

MALICIOUS

PDF

81.5 KB Created: 2020-12-26 22:05:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f238fdf1e741218dfa7ee47b15991848 SHA-1: 926fe1fa9454c06ba8a1c8ce5c2920cfed0c21a5 SHA-256: 9c9fbdfc2dcf1e3f2657e3176ec33b1512fa6c2f76bd075d9c7b77cae7230eb8
234 Risk Score
Tags
free-cdn-ebook-manual-lure

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 it is likely a phishing or malware distribution lure. It contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of numerous external links aligns with link farm or SEO poisoning tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://ggtraff.ru/123?utm_term=gulf+of+riga+regatta In PDF document text
    • https://cdn-cms.f-static.net/uploads/4403121/normal_5fc1f819c6e87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369903/normal_5f8d7693af7c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393904/normal_5f955b3b28f8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476282/normal_5fe61d0311763.pdfIn PDF document text
    • https://pixamowogiru.weebly.com/uploads/1/3/4/5/134590731/5e33e0e0a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374376/normal_5f9926ebf238a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449627/normal_5f9faffe48fa0.pdfIn PDF document text
    • https://zumofimuletoxol.weebly.com/uploads/1/3/4/0/134018509/lidapaxori_jelik_dikosanime.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/9d385095-81e1-460b-ab26-ac94cfa47f90/21325952423.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/matonugatifawuf.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/anatomy_coloring_book_skeletal_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23afd757-df04-4396-af66-eab5825860b8/51163459479.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/99827338655.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a561eaf0-c1b2-42fd-ac1c-eaec256d0791/manco_talon_atv_manual.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_off0000ed56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED56 4564 bytes
SHA-256: 1eef2790874f6e526a3e798a7b6197f6c501fd71e238736b998490d832406cf4
font_01_sfnt_off0000fcf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF7 14776 bytes
SHA-256: 737d7efb8edf6927d7cb8232a10c6aeb1246b6f3811aed8945da2570b2016393
font_02_sfnt_off00012b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B34 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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