Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db6b6b0e5316496…

MALICIOUS

PDF

102.9 KB Created: 2021-02-18 17:39:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7f026035005ccb8956bacbcbb2b28547 SHA-1: d58e44c95ee7b191e86feb59deb47d6dabeb1efb SHA-256: 1db6b6b0e531649612de601a0b3f283358165c9f67c9b6c83ae168e968873dfc
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains or subdomains, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious sites, likely for phishing or malware delivery.

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://jottigo.ru/wix?keyword=dds+5900+manual PDF link annotation
    • https://cdn.sqhk.co/dajusonas/eZbgeJp/photo_collage_software_for_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495691/normal_5fd79d3b92441.pdfIn PDF document text
    • http://helpverifedbadges.com/adam_bruckner_soccern6dvs.pdfIn PDF document text
    • http://odemebayisitrafik.com/zuwitatixegonuwsvf2u.pdfIn PDF document text
    • https://cdn.sqhk.co/nebinefis/QjfUQpf/24133408042.pdfIn PDF document text
    • https://julalawigito.weebly.com/uploads/1/3/4/8/134869680/8324618.pdfIn PDF document text
    • http://hhizmet.com/zofebemupuropelepuraw4gz.pdfIn PDF document text
    • https://cdn.sqhk.co/tezizejaropu/t2haXjh/risirisazomowuvowoz.pdfIn PDF document text
    • https://cdn.sqhk.co/lagolipumepi/ijjX2Ba/xomawixixisizujunoko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501634/normal_6018e466b20e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446643/normal_5ff933af97689.pdfIn PDF document text
    • http://poxijirubulemax.22web.org/33971963926.pdfIn PDF document text
    • https://foduvixet.weebly.com/uploads/1/3/4/4/134498725/2af5e8b57094.pdfIn PDF document text
    • https://cdn.sqhk.co/bivuwusim/hhhg7ie/hangman_online_for_esl_students.pdfIn PDF document text
    • https://womegirig.weebly.com/uploads/1/3/4/5/134506381/6739440.pdfIn PDF document text
    • http://wobixoka.66ghz.com/string_python_format_float.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mulizin.epizy.com/donafusif.pdfIn PDF document text
    • http://jofosomorigifo.rf.gd/75064977001.pdfIn PDF document text
    • http://wasalesex.epizy.com/94492171985.pdfIn PDF document text
    • http://xaxotuk.epizy.com/dna_replication_transcription_and_translation_answer_key.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_off00015a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A19 5296 bytes
SHA-256: 8cabad5d75e8d03675e795593072e926dc4ec0854fa32e9ccf332a75bde1e1ed
font_01_sfnt_off00016c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C10 9980 bytes
SHA-256: 8ac09648001989c85d1f6ca78be81226686b119bcb0e56a7cf368865ef8750d0

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