Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd0fc67978f4acbd…

MALICIOUS

PDF

90.5 KB Created: 2021-05-04 07:36:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0e08359f15b0aa74a873a6cdd0c2177d SHA-1: 9e82e0705b9d164f32cd764a289e46ad5e8395e4 SHA-256: bd0fc67978f4acbdaa7ca5d4d4db5d014a3ff6f61a35edb1b2545be8bd022239
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains text related to 'distorted guitar sound' and is associated with a URL containing the same term, indicating a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/strik?utm_term=how+to+get+a+distorted+guitar+sound PDF link annotation
    • https://mufamemibota.weebly.com/uploads/1/3/1/8/131856380/motobawulakibafedumu.pdfIn PDF document text
    • https://fufukarebalomok.weebly.com/uploads/1/3/4/3/134352968/15af94229ebe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389074/normal_60417c600f496.pdfIn PDF document text
    • http://216tilford.com/wosikexesuleraregufabu4nex0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381098/normal_6031d498a2cb9.pdfIn PDF document text
    • https://cdn.sqhk.co/poxirowo/jfidQih/nefat.pdfIn PDF document text
    • https://rapodiduwegez.weebly.com/uploads/1/3/5/3/135311990/7837788.pdfIn PDF document text
    • https://zubisixoligifi.weebly.com/uploads/1/3/4/4/134479514/5719778.pdfIn PDF document text
    • http://yewes.fun/mblex_study_guide_2019_freemwr7f.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/XIggho0/42729841901.pdfIn PDF document text
    • https://kiwotatuna.weebly.com/uploads/1/3/1/8/131856308/4064426.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380068/normal_5ff8af1f39f30.pdfIn PDF document text
    • http://skywonder.space/screenwise_meter_malfunctioning87h2n.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://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_8d5a646412464fe4a6ce94c414e9f866.pdf?index=trueIn PDF document text
    • https://e6676b24-921d-4f57-8fca-beda98688f3c.filesusr.com/ugd/144d27_a2c44979873c4d41a01145b44d312852.pdf?index=trueIn PDF document text
    • https://17851959-1482-4b49-8222-7b7b0c628459.filesusr.com/ugd/3cb679_9b87a1174f874a9296f51b0f0eea922c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/55793362154.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/katalog_claas_consul.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/14233724312.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_off00011698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11698 4896 bytes
SHA-256: 8043e16533c47dba5878fcc02df82912b7fe29f0b2209a4aeb0d678a59f7c825
font_01_sfnt_off00012755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12755 11144 bytes
SHA-256: 096ed3eb12d041ed34754e88c9414152eb031eeb04653ec75f23e4f7b86c6241
font_02_sfnt_off00014d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D01 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176