Malicious PDF — malware analysis report

Static analysis result for SHA-256 81fceaad93a7e60b…

MALICIOUS

PDF

80.3 KB Created: 2021-02-27 01:00:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 138d5bf8c4b920f1d115537c82233f28 SHA-1: 1f6ccdcf9186d2ed3e0360f23b7c5f3c84bfe8b5 SHA-256: 81fceaad93a7e60b11ba49520a2772cb6ee3a9b37fa0182181b092980ae4a9d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable domains, strongly suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'craigslist', potentially used as lures.

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://bologen.ru/wix?keyword=hit+and+miss+engines+for+sale+craigslist PDF link annotation
    • http://vvinorama.website/cards_against_humanity_offensive_packsohd78.pdfIn PDF document text
    • http://mon-cmso.best/mlsu_private_form_last_datel1nyo.pdfIn PDF document text
    • http://baltika-trans.ru/tanede0gsse.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/67198874447.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485704/normal_5fec9e1923c73.pdfIn PDF document text
    • http://remont-kholodilnikov.website/86508925733ux30r.pdfIn PDF document text
    • http://wumewil.sportsontheweb.net/6735786892.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/another_fine_myth_book.pdfIn PDF document text
    • http://8gusevshop.space/84099267306zbhxt.pdfIn PDF document text
    • http://eeuuurrrrr.space/59212806785fktn0.pdfIn PDF document text
    • http://itsnat.space/demoleqeth3.pdfIn PDF document text
    • http://pc-remont.website/wings_of_fire_book_4_graphic_novel_read_online_freerdlah.pdfIn PDF document text
    • http://salonlabs.xyz/marivu3qbg4.pdfIn PDF document text
    • http://bafiselavanebep.mywebcommunity.org/dupibuzovawu.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://s3.amazonaws.com/zoromexemuzid/bipolar_transistor_cookbook.pdfIn PDF document text
    • http://ginowane.onlinewebshop.net/frigidaire_refrigerator_parts_fghc2331pfaa.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/twin_extra_long_platform_bed_frame.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/79187394232.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_off0000f0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B7 5088 bytes
SHA-256: 961fb2fe676de1b60652af98b952950aa04916c32d5bd4411b00f409776c3bfb
font_01_sfnt_off000101df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DF 10632 bytes
SHA-256: 112046b376dfbee24fc5caa651b6a7ae9e55c40e64813c29ca5f430ceee6ba87
font_02_sfnt_off000125d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D0 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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