Malicious PDF — malware analysis report

Static analysis result for SHA-256 1feafeb75162c106…

MALICIOUS

PDF

68.1 KB Created: 2021-02-13 18:23:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a85d6e3cbd5473ad7b654146ef29d7ca SHA-1: 466f54dc652b27728a1325de9959e62f6237e15c SHA-256: 1feafeb75162c106b616f7e4964e8c032a3d67d3592a5ae91da8a9ff736b1c3a
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body is heavily obfuscated, but the presence of embedded URLs suggests an attempt to direct the user to external, potentially harmful sites. The primary attack pattern observed is the use of malicious links within a PDF document, likely as part of a phishing or malware distribution scheme.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wb?keyword=a%20p%20name In PDF document text
    • http://azorocheat1.xyz/3m_fire_barrier_sealant_spec_sheetsfxyc.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/cAZihb5/new_dragon_city_hack_tool_game-_hacks._net.pdfIn PDF document text
    • https://cdn.sqhk.co/zeragekub/cMnRgfz/josuwurufebipasidulaxoso.pdfIn PDF document text
    • https://cdn.sqhk.co/susojareb/gfgghdM/kafagedevola.pdfIn PDF document text
    • http://mkr-olimp.info/fluid_resuscitation_guidelines_in_septic_shockvguy7.pdfIn PDF document text
    • http://temilops.xyz/telecharger_lecteur_gratuit_pour_windows_103dh4r.pdfIn PDF document text
    • http://tohld.in/52135128580p5c1b.pdfIn PDF document text
    • https://cdn.sqhk.co/jekefebiba/gh6vJje/87056868784.pdfIn PDF document text
    • https://cdn.sqhk.co/zeliravepuj/aghgjZ4/altered_ego_salon_and_spa_myrtle_beach.pdfIn PDF document text
    • http://mini-cam-v2.club/simplification_approximation_questionsw1kdz.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/dMThdgi/dr._driving_apk.pdfIn PDF document text
    • http://fakaripeti.xyz/paper-_io_3d_onlinevfcun.pdfIn PDF document text
    • http://thrivewebs.com/vuravokoxamuroluoo8o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://teredibake.rf.gd/cv_format_for_job_application_sample.pdfIn PDF document text
    • http://nogobixa.epizy.com/59740459096.pdfIn PDF document text
    • http://wumimed.rf.gd/pemeda.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_off0000d07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07B 4648 bytes
SHA-256: 1b1b9571971421b8128062c258cb66a0d724b7d6511870f775a1cc4f0210ea44
font_01_sfnt_off0000e03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03D 10468 bytes
SHA-256: dda209ebd505b2d4575ffb07cf0c6f187abcafe69bec866c3d7a2e2e5f1c2324

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