Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1be66093f2b27bb…

MALICIOUS

PDF

78.4 KB Created: 2021-02-26 21:02:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7614d3de07e1dd825d2146986f464341 SHA-1: 2f2be0774e50730b605fbe56eb8e6631626f15ac SHA-256: f1be66093f2b27bb8ed924424a89a7699eee2844d6c09abb6bcdd6ec41ed7e6c
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, many pointing to disposable hosting services, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The document body, though heavily obfuscated, appears to contain keywords related to music equipment, likely as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://leonvi.ru/aws?utm_term=fender+mustang+floor+effects+list PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4427282/normal_5ff4b83ced7b2.pdfIn PDF document text
    • https://godivibodo.weebly.com/uploads/1/3/4/0/134040440/xatufosaraxusoxet.pdfIn PDF document text
    • https://pejupatuwotim.weebly.com/uploads/1/3/2/8/132814375/puwaninununava-xenupesufowal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454541/normal_5fd1d2423712e.pdfIn PDF document text
    • https://buxijabis.weebly.com/uploads/1/3/5/3/135329720/rikepazi-nobuvulidig-wuxoman-wonekudema.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465703/normal_6015c10b9adf0.pdfIn PDF document text
    • https://pofifeluvoka.weebly.com/uploads/1/3/0/7/130739131/bf028f13.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385633/normal_6003b06df2d7c.pdfIn PDF document text
    • https://tesiligozi.weebly.com/uploads/1/3/1/4/131407846/7304300.pdfIn PDF document text
    • https://befutoxe.weebly.com/uploads/1/3/4/4/134443098/89b6fc057f0b6b.pdfIn PDF document text
    • https://doxazefeseremef.weebly.com/uploads/1/3/4/7/134764644/3922791.pdfIn PDF document text
    • https://nemelodanunoju.weebly.com/uploads/1/3/0/8/130874480/ea84bc5b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462345/normal_5ff366b99ee11.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://s3.amazonaws.com/bepukuba/99673078518.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_off0000e7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CF 5180 bytes
SHA-256: 2cc42c82e5182a9256c9e0919ab1c78476038cd77b48f2559e925c3f7fe762e4
font_01_sfnt_off0000f94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94B 10252 bytes
SHA-256: 1128eac26732b7540b4003fb9ef985fb3f133aa8ca87a652df19a3de922d94bf
font_02_sfnt_off00011c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C68 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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