Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd053c5b694c2120…

MALICIOUS

PDF

77.0 KB Created: 2021-02-24 11:49:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: a7fe1e3a44298c54fae12ef811d74510 SHA-1: 7ef4bc3c02becc3297b2c7ef8e1138e68de86a6c SHA-256: cd053c5b694c21207ad60e55fb31f0d241133616ee68dbf37d9bfce5da1c1a9b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to lure users to malicious sites.

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://leonvi.ru/strik?utm_term=a+scanner+darkly+online+castellano PDF link annotation
    • http://zudalipa.22web.org/dozuze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451950/normal_600235e9d903a.pdfIn PDF document text
    • http://it50save.info/hda_le_dormeur_du_val63jgq.pdfIn PDF document text
    • https://cdn.sqhk.co/danexili/wff1ibi/78178953693.pdfIn PDF document text
    • http://reactivaperu-viabcpi.com/72995415607lxhea.pdfIn PDF document text
    • http://mavpa.fun/jekafazujibepuwalenamkvycc.pdfIn PDF document text
    • http://tonagruz.ru/zabijarofidobabudenotikop7h.pdfIn PDF document text
    • https://cdn.sqhk.co/xovepejegosi/Xidia1e/rush_hour_cast_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488315/normal_602fe0708f7ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486354/normal_6006946f7e710.pdfIn PDF document text
    • https://cdn.sqhk.co/regomesu/h9ggDOc/fake_number_call_app_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365547/normal_6031efd9a76d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459805/normal_60106c27609e2.pdfIn PDF document text
    • https://cdn.sqhk.co/molivovuki/idifqhj/7995172033.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tawegimasozaj.epizy.com/how_to_draw_zentangles_for_beginners_step_by_step.pdfIn PDF document text
    • http://kutelitowolobe.rf.gd/12841625868.pdfIn PDF document text
    • http://pakafadudu.epizy.com/56302982017.pdfIn PDF document text
    • http://mokimonanogi.rf.gd/binomial_distribution_problems_with_solutions.pdfIn PDF document text
    • http://revuzulikasulo.epizy.com/15252263517.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_off0000f0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B7 5088 bytes
SHA-256: c40b2cb69d188fbeacdeea185a3fd58c34a9e81a47c93db1cb5132407039cdd9
font_01_sfnt_off0001021f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021F 10528 bytes
SHA-256: 071828f689a815dae45c252f06c10df58cd10e9bd0f793592327e11bb2ea3c0a

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