Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4168133f06e9f20…

MALICIOUS

PDF

82.0 KB Created: 2021-05-20 17:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: bd652c01ea55352b2d0d05f5bb23cce9 SHA-1: 288010a479c3fedf7dc48eace9ab91bf1378d6c0 SHA-256: d4168133f06e9f20e05ee1bf810cb30c49dfc505c3199f940fc1cab4f6c3ee13
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, and one primary URL that appears to be a redirector. The document body is heavily obfuscated, but the presence of numerous links suggests an attempt to direct users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=chinese+character+workbook+pdf PDF link annotation
    • https://sifirugosiwoxam.weebly.com/uploads/1/3/1/3/131384024/3799831.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462688/normal_6038d1f44cfd0.pdfIn PDF document text
    • https://dopovubejaxow.weebly.com/uploads/1/3/4/0/134017692/wewiz.pdfIn PDF document text
    • https://voxiranadazezud.weebly.com/uploads/1/3/5/3/135312978/berarunazorava-narowekejubepom-senatawowes-desusaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474231/normal_5fe92c4d9632b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456660/normal_606e67c24cf24.pdfIn PDF document text
    • https://feroxetisilujux.weebly.com/uploads/1/3/1/4/131409167/pakikibesapijumefo.pdfIn PDF document text
    • https://linebabeta.weebly.com/uploads/1/3/5/3/135317009/fc35d6e0d.pdfIn PDF document text
    • https://jewelilug.weebly.com/uploads/1/3/4/3/134331877/xifimaxegatop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ece76c4-4314-41ee-ba46-54879c9ec98c/nonviolent_synonym_words.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2cfd414-c079-4e34-96f7-ea71cd096f97/how_to_use_anova_precision_cooker_nano.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/53992339463.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f16ac6a-52dd-40bf-84a9-98e284d9f3b0/1992937040.pdfIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/es1j_smd_diode_datasheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93332620-c638-43c6-8829-3da2cd8ee9c6/75739156301.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24c46e51-c327-444a-a543-41ddf62e2e42/tabela_fator_correo_tjmg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cffdfa9-a7bd-4592-afcb-02109bfb336a/ib_biology_ia_lab_report_example.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_off0000e622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE622 8328 bytes
SHA-256: 4afcfbcf42d5b44296e9ad83c79a662d57aa76d97583e5e859b1ed5b3748680e
font_01_sfnt_off0001023c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023C 5412 bytes
SHA-256: e1d60d0a5ccbc3a4f87282d7c4236a3a4b5c3c2787a1cfbf573f866a725b35ee
font_02_sfnt_off000114a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A7 11180 bytes
SHA-256: 84de9333e505420b8c13d0400ab8cf4500cc239b3bf7f6cd9511ef77ba2a388e

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