Malicious PDF — malware analysis report

Static analysis result for SHA-256 6245b71d60a298db…

MALICIOUS

PDF

64.9 KB Created: 2021-02-15 14:33:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 3a409680ed646b945d9cab1763943f7b SHA-1: fc123b4a16b861353c4f453744f80e669747310d SHA-256: 6245b71d60a298db79fe31330b9c2f07575c7257164d4773ecaac73e9344c63a
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting services and redirectors, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious redirection scheme.

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
  • 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 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.
  • 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://crophysi.ru/strik?utm_term=autocad+3d+commands+in+hindi In PDF document text
    • https://neseroto.weebly.com/uploads/1/3/5/3/135326238/6007259.pdfIn PDF document text
    • https://gororumemi.weebly.com/uploads/1/3/4/5/134517819/7747508.pdfIn PDF document text
    • https://dotanivim.weebly.com/uploads/1/3/4/7/134705276/8137169.pdfIn PDF document text
    • https://sijalafad.weebly.com/uploads/1/3/4/8/134887162/5824304.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484820/normal_6014f2b594ec8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404500/normal_5ff0cc5c969c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456686/normal_601547ae216e8.pdfIn PDF document text
    • http://dusixose.22web.org/aambala_tamil_movie_songs_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475391/normal_5fd919317ed4a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497071/normal_5feed25d1ff26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463002/normal_600f130e050f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416929/normal_5fde04e7c6a57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452852/normal_60234672e16de.pdfIn PDF document text
    • http://kikebumanexewuj.22web.org/factoring_sum_and_difference_of_cubes_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413573/normal_601999985b500.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/goneduzum/mulafebajuto.pdfIn PDF document text
    • https://s3.amazonaws.com/dojonuta/windows_10_bluetooth_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/hana_cockpit_2._0_administration_guide.pdfIn PDF document text
    • http://pamixawikisif.epizy.com/wopuletonatiwowusu.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_off0000c274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC274 5204 bytes
SHA-256: 0ced5d5a2ff33a783a531dde7cf005135f04ae6995ac0ddfc3b5c60f56d4ea83
font_01_sfnt_off0000d40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40A 10200 bytes
SHA-256: 99bd3be559ee7e065571e6a3179b08b20d1e4053fa4cd37746aea9b76fe01291

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