Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bca41517e1b12b4…

MALICIOUS

PDF

75.2 KB Created: 2021-02-11 03:45:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 839342556e7b7119866aabe75f1096cd SHA-1: 1af9526ba1de105ae93f3a332a72318100ec3e93 SHA-256: 9bca41517e1b12b49e7f8532eebc0feb860c68f2a8adfc8b3fb802639380bb19
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one pointing to 'baarspo.ru', flagged as a potential phishing or malware distribution site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's structure is designed to host many links on disposable hosting, further supporting a malicious intent. Although no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score suggest this PDF is part of a malicious campaign, likely a phishing lure or a downloader.

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 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://baarspo.ru/123?utm_term=taco+tuesday+san+diego PDF link annotation
    • http://bigpleasure.ru/adobe_air_flashvj3ev.pdfIn PDF document text
    • http://repaircreditscore.info/42770350256050si.pdfIn PDF document text
    • https://fexaxotira.weebly.com/uploads/1/3/5/4/135401388/3526108.pdfIn PDF document text
    • http://mamajan.space/rv_campsites_in_myrtle_beach_south_carolina8m9w0.pdfIn PDF document text
    • http://smallita.space/xafusinubatilifd5mae.pdfIn PDF document text
    • http://lnstgramhelpcopyright.com/sazexegelokerivura8nhr.pdfIn PDF document text
    • http://ezfix.asia/lulozopokq9ff.pdfIn PDF document text
    • http://titoto.xyz/86128372095fs7l.pdfIn PDF document text
    • http://winfreeiphone.xyz/calculate_total_hours_in_google_sheetssfhcn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/berebemuguwezelewenowewef.pdfIn PDF document text
    • http://mesesoriran.epizy.com/definition_of_psychology_by_william_james.pdfIn PDF document text
    • http://zubumedi.rf.gd/avatar_music_indonesia_apk_data.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/nemesis_sentence_formation.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/tumexexibux.pdfIn PDF document text
    • http://fosixokosed.rf.gd/pisixinugesit.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_off0000e77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77B 5032 bytes
SHA-256: a5e5e1be30b99001a469319e0fa21ac1c1acdbfcb405bbce9a12433a68f3fa0a
font_01_sfnt_off0000f8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B7 11544 bytes
SHA-256: 37d79e410b5ecac5f36c684b85553d0ac6b76f943bdb831d66cb18779e0a01dd

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