Malicious PDF — malware analysis report

Static analysis result for SHA-256 7733c81abbd7c742…

MALICIOUS

PDF

76.3 KB Created: 2021-01-16 15:17:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e70b2388f81b31d6d558381b086c3ef4 SHA-1: 6961a0fca38163b448092d0efe441d6882c892c0 SHA-256: 7733c81abbd7c742f93fdbfbb1daf5f33012a4d3477c73d4c75ac97ee9d1ca78
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains, which is characteristic of SEO spam or phishing campaigns. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded links likely serve to redirect users to malicious websites or download further payloads.

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://trafffi.ru/aws?utm_term=appendix+of+a+project+report PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378830/normal_5f964b8a936eb.pdfIn PDF document text
    • https://site-1166051.mozfiles.com/files/1166051/hits_1_usa_radio_owners_manual.pdfIn PDF document text
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/lopolirubaz-rasufadajego.pdfIn PDF document text
    • https://site-1084156.mozfiles.com/files/1084156/collagenase_ointment_davis.pdfIn PDF document text
    • https://koropiliful.weebly.com/uploads/1/3/0/7/130740252/cb617cbcd9e0ab8.pdfIn PDF document text
    • https://cdn.sqhk.co/livatunozasu/ngjxPXB/assassin_s_creed_syndicate_evie_best_outfit.pdfIn PDF document text
    • https://gogozugibijom.weebly.com/uploads/1/3/4/3/134369614/8ed4be.pdfIn PDF document text
    • https://site-1178602.mozfiles.com/files/1178602/bang_bang_bang_lyrics_mark_ronson.pdfIn PDF document text
    • https://kufibewiti.weebly.com/uploads/1/3/1/4/131406300/difapefe_lugodop.pdfIn PDF document text
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/805149.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/kadijamiruvinugeno.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ee4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4F 5072 bytes
SHA-256: 8d0bb653a40dcee21de24de5d6604ac4a2c3850881e42d6ba3f4076cdc5893f4
font_01_sfnt_off0000ffb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB0 10772 bytes
SHA-256: 63c8f5f2c49158031e0dfda85812fcbf45cca50287c9e64e4707e5b9be1e3c2e

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