Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bbec3fd8c562aa3…

MALICIOUS

PDF

97.0 KB Created: 2021-02-26 09:25:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 52b003c9bb7299c945c4cb9ef617898a SHA-1: e121ec0812f524e6a40580f757f8bcfe91a992e9 SHA-256: 1bbec3fd8c562aa3fb15166f13a07b61db52bcc9c17c47e397041e859dc8dd32
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links to disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware delivery mechanism, likely involving the exploitation of PDF vulnerabilities or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/award?keyword=ingersoll+rand+air+compressor+2545+parts+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416805/normal_6010b2d11847e.pdfIn PDF document text
    • http://blancop.xyz/canon_pixma_922_printing_blank_pagesat9ah.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501501/normal_60200a747bdaa.pdfIn PDF document text
    • http://xruhdfo.site/25240753396wk92.pdfIn PDF document text
    • http://wordsidepost.top/47597717509ktf4w.pdfIn PDF document text
    • http://myyshooop227.site/carlos_castaneda_downloadqsobn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480743/normal_60339c9355c2d.pdfIn PDF document text
    • http://nipokaxa.getenjoyment.net/toner_for_brother_mfc-8710dw_printer.pdfIn PDF document text
    • http://doweryklkq.space/call_me_by_your_name_scriptfnwmo.pdfIn PDF document text
    • http://jiteruruw.sportsontheweb.net/craftsman_17.5_hp_riding_mower_manual.pdfIn PDF document text
    • http://natnat.fun/gilakowagulanusagagelixapgu8gr.pdfIn PDF document text
    • http://zalavsky.ru/guide_de_conversation_franais_portugaisfaiam.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/the_holy_quran_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384642/normal_6020fc1fd27f9.pdfIn PDF document text
    • http://rowowevu.mypressonline.com/difopidujalusakagixot.pdfIn PDF document text
    • https://cdn.sqhk.co/fosojatesog/Agjjahh/41551921989.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376621/normal_5fe2f5f0dcb74.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF9 3908 bytes
SHA-256: 81d3ec979e748d064050b86af5b804117a782c86b2cc7d5118d220329b47d7f1
font_01_sfnt_off00012bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC3 5676 bytes
SHA-256: e7538cbf578dd1a405a5a2948ff1e86af87f29c3ed25f8f4c9c41466673f4d02
font_02_sfnt_off00013f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F0E 17288 bytes
SHA-256: 6077dce34ad9e39478ff6085b4038336fcb49825f29daf2a1b081ff254ef763a

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