Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf21b83ec6fb65e…

MALICIOUS

PDF

73.6 KB Created: 2021-01-13 05:23:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 157d1a6003e7e8d8ee6ddcda8b7191a1 SHA-1: 91c16258105371fc20b599547303aa2ae7d2c587 SHA-256: 6cf21b83ec6fb65e96b9a7f6f847604d58b78a8adf2c2ed18ddf492eb33eee6c
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs point to various PDF files, likely serving as a lure or redirect mechanism to malicious content. No scripts were extracted, but the PDF structure and numerous external links strongly indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/wb?keyword=alien%20arcade%20game%20rom PDF link annotation
    • https://cdn.sqhk.co/rosomugimo/gngeieC/imfdb_city_heat.pdfIn PDF document text
    • https://cdn.sqhk.co/soredepel/jc6gKUU/sonny_and_cher_the_beat_goes_on_chords.pdfIn PDF document text
    • https://cdn.sqhk.co/walumupo/UUr1Bpe/9066048446.pdfIn PDF document text
    • https://burubigek.weebly.com/uploads/1/3/4/8/134884838/5803358.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/ddnja0q/zovobexox.pdfIn PDF document text
    • https://site-1177940.mozfiles.com/files/1177940/duxusujizorudapor.pdfIn PDF document text
    • https://site-1180109.mozfiles.com/files/1180109/roteruzo.pdfIn PDF document text
    • https://cdn.sqhk.co/busanurutar/W1SPMNQ/new_soap_cutting_slicing_asmr_function.pdfIn PDF document text
    • https://cdn.sqhk.co/nadudegimew/ygfgi5d/calla_lily_tattoo_sleeve.pdfIn PDF document text
    • https://dezazobe.weebly.com/uploads/1/3/4/7/134755526/migazak.pdfIn PDF document text
    • https://site-1178876.mozfiles.com/files/1178876/36162542324.pdfIn PDF document text
    • https://site-1178617.mozfiles.com/files/1178617/15890059595.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/dotivaf/import_font_awesome_in_stylesheet.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_off0000d725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD725 4780 bytes
SHA-256: d81a57b3ad97c0d203c3c6a35ea9d1ff613e04cb5607e8b75a12290bce5d024f
font_01_sfnt_off0000e730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE730 10744 bytes
SHA-256: 97e9530615cc623fd3ebc860f15a268029f0ee28940bc2a51e9769e88d133afc
font_02_sfnt_off00010c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C06 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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