Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8dbf1e9fbf4e9ea…

MALICIOUS

PDF

75.9 KB Created: 2021-06-02 13:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 415857e1404b404d4f202b6ef63a49f4 SHA-1: f9388ca6eacf2df745add2bf2daabba8b8d43954 SHA-256: c8dbf1e9fbf4e9ea881e2dad9d43fbc36ee2cd67a4c1468276fa9641e8c7b1f4
186 Risk Score

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. It contains a large number of external links, many hosted on disposable domains, characteristic of a link farm or SEO spam operation. One of the embedded URLs, 'https://wastran.ru/pbw?utm_term=whitebox+learning+glider+quiz+answers', suggests a lure related to quiz answers. No scripts were extracted, but the PDF structure and numerous external links indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://wastran.ru/pbw?utm_term=whitebox+learning+glider+quiz+answers PDF link annotation
    • https://jotabaputeja.weebly.com/uploads/1/3/5/3/135350690/9446812.pdfIn PDF document text
    • https://wexixumativedo.weebly.com/uploads/1/3/4/8/134865676/7151586.pdfIn PDF document text
    • https://mixifotosipepe.weebly.com/uploads/1/3/4/8/134875306/3153479.pdfIn PDF document text
    • https://jawutasujo.weebly.com/uploads/1/3/0/9/130969833/322273.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488101/normal_6019d5155cc42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469634/normal_605fff0f3d9cf.pdfIn PDF document text
    • https://jefiwosu.weebly.com/uploads/1/3/1/3/131379536/732d512ce6ad7b2.pdfIn PDF document text
    • https://rojogibolodo.weebly.com/uploads/1/3/0/7/130775817/764508.pdfIn PDF document text
    • https://bekefopu.weebly.com/uploads/1/3/4/6/134692172/xobole_susasot_jeligesanafes.pdfIn PDF document text
    • https://baresifesej.weebly.com/uploads/1/3/4/1/134131831/2360203.pdfIn PDF document text
    • https://mufuxavezefajox.weebly.com/uploads/1/3/4/4/134497947/jakoxovofiwe.pdfIn PDF document text
    • https://tuxenovizomojow.weebly.com/uploads/1/3/7/5/137516496/eecbe5fe2b0.pdfIn PDF document text
    • https://bolewotimeri.weebly.com/uploads/1/3/4/6/134689798/vivunifemire.pdfIn PDF document text
    • https://mudodikakagiluz.weebly.com/uploads/1/3/4/5/134598929/4694203.pdfIn PDF document text
    • https://detabifaf.weebly.com/uploads/1/3/1/4/131436978/fumudubepov_dobabuja_xovuvud_womog.pdfIn PDF document text
    • https://vawevoza.weebly.com/uploads/1/3/1/4/131482963/fulufukavojuwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365553/normal_60210d80915a8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vafobotigef.pbworks.com/f/10th_class_biology_textbook_telugu_medium.pdfIn PDF document text
    • http://visetululiv.pbworks.com/f/61858409723.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_off0000e7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E4 5576 bytes
SHA-256: fff194d88e23c3a863e4f54811f1a9bd799f22a69ad0cf04d47bd343db17b81a
font_01_sfnt_off0000faf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF3 11608 bytes
SHA-256: 722fa7e35c7fab84486c46c5afe731a4cbbf976dc65445d347e59b1c6dda22f5

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