Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ec609c918bfc25e…

MALICIOUS

PDF

75.8 KB Created: 2020-11-26 04:54:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 4109debc08c4508b1e64b8e102bf2f00 SHA-1: b617e8bae7493fae40ad0357eda9e84f895d7d53 SHA-256: 9ec609c918bfc25e7303a85b6768e468ddf38ac541e10492513d08338f95d8a2
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with a critical heuristic flagging it as a 'PDF_SEO_LINK_FARM'. One of the primary external URIs points to 'https://traffine.ru/123?utm_term=order+of+battle+five+forks', suggesting a phishing or content distribution lure. Although no scripts were explicitly extracted, the PDF structure and the presence of external links are indicative of a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffine.ru/123?utm_term=order+of+battle+five+forks PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460466/normal_5fb460eb3361a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410027/normal_5f9fefbd049bc.pdfIn PDF document text
    • https://bufezemaz.weebly.com/uploads/1/3/4/7/134714495/2735810.pdfIn PDF document text
    • https://gemuvubakada.weebly.com/uploads/1/3/4/4/134494784/gewupesiduvu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418013/normal_5fae598d63cdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366645/normal_5fa4bbb65125e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/35beea4b-b1a4-4a60-b8e2-ab82ba307079/81746291319.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/yu_liu_md.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1a6c418-8987-4004-8e12-301b8c8cd498/laworasepela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc872ee2-8b33-4537-aa6e-ee36d431973a/rogeliperibegumuju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e0f2e39-c35b-4d10-8c26-30f77cdafbf2/tetexupatotetomirefuw.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/element_55_inch_tv_wall_mount.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1beb207e-20eb-437c-9018-8679a821996a/jermaine_stewart_the_word_is_out_lyrics.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_off0000e929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE929 5192 bytes
SHA-256: c1f62301fd3e11e66d89765dd0c33a5bd4b8421d7eabc0ffb4b015cb1ca638ea
font_01_sfnt_off0000fae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE4 11708 bytes
SHA-256: 6da6e6bca1832f05b82c2b4db16efe96a0c284ce685e5506e92b5b0545122bdd

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