Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c13d3fe137f0612…

MALICIOUS

PDF

86.9 KB Created: 2021-02-24 08:16:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d5e27eb514c6eec0a0e5d3e2ca4c6817 SHA-1: 1acece3fffd54ed8dcc053f9ecee11958d1d359c SHA-256: 7c13d3fe137f061255ba1d52bdf0091c84fde8e647945ccc608f89ddf59c54d1
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to disposable domains, indicating a link farm designed to redirect users. The document body mentions 'how to unlock your zte phone for free', suggesting a phishing or scam lure. The ML classifier and ClamAV detection strongly indicate maliciousness, with the primary technique being spearphishing attachment to deliver users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=how+to+unlock+your+zte+phone+for+free PDF link annotation
    • https://digikugububim.weebly.com/uploads/1/3/0/7/130774990/tifeminu.pdfIn PDF document text
    • https://cdn.sqhk.co/letopoto/5gdgchi/90674783510.pdfIn PDF document text
    • http://mamunetosi.iblogger.org/17130967572.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483089/normal_5fcae9cbcd4c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459939/normal_5ff4268130981.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/DU3jegi/money_origami_heart_step_by_step.pdfIn PDF document text
    • https://cdn.sqhk.co/tavanaru/RhgijJB/durulasojilexokalelupew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405208/normal_60087cdd0b91e.pdfIn PDF document text
    • https://cdn.sqhk.co/waxobakal/jdhahbr/space_invaders_counter_arcade_machine_arcade1up.pdfIn PDF document text
    • http://wamuvosuvebupa.iblogger.org/hp_stream_11_pro_laptop.pdfIn PDF document text
    • https://tinubuwetoka.weebly.com/uploads/1/3/5/3/135325034/tomoluzitazow_dofuzadaf_kimopefe.pdfIn PDF document text
    • https://luxovifawus.weebly.com/uploads/1/3/4/3/134341193/zulorudevuka.pdfIn PDF document text
    • https://cdn.sqhk.co/dibitarebizu/QyjeBPF/redum.pdfIn PDF document text
    • http://zawugexoj.22web.org/centre_tapped_transformer_vs_normal_transformer.pdfIn PDF document text
    • https://cdn.sqhk.co/semobisugigi/gaUicgj/linepisodekinolepokoxev.pdfIn PDF document text
    • https://babidunilatejob.weebly.com/uploads/1/3/4/2/134266015/6702746.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tituroxir.rf.gd/jazeromivagivowovafobobo.pdfIn PDF document text
    • http://japixunatavaxi.rf.gd/dulif.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_off0001176c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176C 4984 bytes
SHA-256: 4f392f5c0bb4db2b44ee4d68d425edc3f5284803e9d58678bb8a3216f5b2cf63
font_01_sfnt_off00012880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12880 11336 bytes
SHA-256: ed6380ef8e552d7f83e55238bf7567f96522ca3cc940e4f825034b4da4fdd31c

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