Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f7445b5691abdcc…

MALICIOUS

PDF

69.8 KB Created: 2021-02-20 20:33:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6567a35ee66ea8dd1c5ea7602aac6aa5 SHA-1: d8319acdc92bfaccce3c5134bbdb91a1859ee014 SHA-256: 3f7445b5691abdccbf3e07b36ccde81178762a677481db4a85b12215bc4599d6
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The embedded URL `https://jottigo.ru/strik?utm_term=to+be+a+slave+book+summary` is likely part of this malicious infrastructure. No scripts were extracted, but the PDF structure itself facilitates the attack.

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://jottigo.ru/strik?utm_term=to+be+a+slave+book+summary PDF link annotation
    • https://fuwipinax.weebly.com/uploads/1/3/4/0/134016709/ximefizugagepo_dorujip_pafujadolon.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/i5iar9P/picture_crossword_puzzles_for_grade_1.pdfIn PDF document text
    • https://lewuroluloxujul.weebly.com/uploads/1/3/4/6/134678017/9239861.pdfIn PDF document text
    • https://cdn.sqhk.co/pedidagow/bFiijdY/91700914549.pdfIn PDF document text
    • http://businessmentality.com/botigigamasuto0uye.pdfIn PDF document text
    • https://kasugokadudibuk.weebly.com/uploads/1/3/4/7/134740653/weboro_kuzow_zanujigu.pdfIn PDF document text
    • https://xekobemakisusij.weebly.com/uploads/1/3/1/4/131438823/rejobuxe.pdfIn PDF document text
    • https://kinigapiluxuke.weebly.com/uploads/1/3/4/8/134863840/6554387.pdfIn PDF document text
    • http://nasty666.space/photo_mechanic_5_serialmzpp3.pdfIn PDF document text
    • https://nosevale.weebly.com/uploads/1/3/2/6/132683459/kujeka.pdfIn PDF document text
    • http://tovelksa.website/70725777357wunzh.pdfIn PDF document text
    • https://mokizafot.weebly.com/uploads/1/3/5/3/135347773/nizunugumajilogiw.pdfIn PDF document text
    • https://fiwibafufo.weebly.com/uploads/1/3/0/7/130774969/tujikububifedixo.pdfIn PDF document text
    • https://cdn.sqhk.co/xotosira/gHidceO/73103021528.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/budavufakifog.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/vanguardias_del_siglo_20.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/animal_quizzes_with_answers.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_off0000d331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD331 5144 bytes
SHA-256: ead8a8315560e8fd2bb8b6764ad117cd8ac4a9d73b36ff9591cbd8e23515842d
font_01_sfnt_off0000e4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AC 11120 bytes
SHA-256: 30e369b6ad605b8b40cd53db4daf281498ef273e73380e743b5aa5f8f2aa48d5

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