Malicious PDF — malware analysis report

Static analysis result for SHA-256 f02729211eeb6f8f…

MALICIOUS

PDF

70.6 KB Created: 2021-02-18 23:27:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5b2d4602f5ca15dec3d53ac4258b5a05 SHA-1: 7c59f64576ef109f6088d88703b253b661db7fee SHA-256: f02729211eeb6f8fb0962a39a1630588018c6b0319e3f041f689c45ee6f8f8f3
244 Risk Score

Malware Insights

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

The PDF contains a link disguised as a crochet pattern, which redirects to a known malicious URL. The document also hosts a large number of external PDF links, many on disposable hosting, suggesting a link farm designed to manipulate search engine results or distribute malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

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://yafferge.ru/strik?utm_term=crochet+pattern+for+child%2527s+hat+with+flower In PDF document text
    • https://wixokaregojes.weebly.com/uploads/1/3/2/6/132681478/1b6e4b1.pdfIn PDF document text
    • https://cdn.sqhk.co/magatile/lgfjigj/30034243945.pdfIn PDF document text
    • https://cdn.sqhk.co/tunaluvum/nhbJ1te/tufojigegugonanuzilifi.pdfIn PDF document text
    • https://sofepusususe.weebly.com/uploads/1/3/1/6/131636682/debupupibagonukerere.pdfIn PDF document text
    • https://dikemogegopur.weebly.com/uploads/1/3/1/4/131406608/122748.pdfIn PDF document text
    • https://cdn.sqhk.co/tasaxasup/ahhjchb/real_air_jordan_1_cheap.pdfIn PDF document text
    • https://cdn.sqhk.co/defisepeniba/d5fvuiZ/tomb_raider_2021_movie_insider.pdfIn PDF document text
    • https://cdn.sqhk.co/mirofifuba/dHPHibT/lodifuf.pdfIn PDF document text
    • https://jipafedi.weebly.com/uploads/1/3/0/8/130813136/7254133.pdfIn PDF document text
    • https://suwudaxodorepe.weebly.com/uploads/1/3/4/8/134885248/beperotisar.pdfIn PDF document text
    • https://cdn.sqhk.co/susojareb/ajcicid/lapivoxufibefon.pdfIn PDF document text
    • https://vopasigujar.weebly.com/uploads/1/3/0/8/130813381/25e0c3b9a0f.pdfIn PDF document text
    • https://noruwapawufibem.weebly.com/uploads/1/3/0/9/130969999/33c279.pdfIn PDF document text
    • https://cdn.sqhk.co/naveropifo/hjhjejh/birds_of_prey_cast_2002.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/befarekogol/calendar_ortodox_roman_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/bexolamabad/56244420600.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/libros_mikrotik_academy_xperts.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/belize_visa_application_form_online.pdfIn PDF document text
    • http://latilofu.rf.gd/derived_units_worksheet.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_off0000d65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65D 5276 bytes
SHA-256: d794ec59a10b17e3a52a616be9b2b5ec9609cb9878a30f11d775d9bcaa5a6c68
font_01_sfnt_off0000e862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE862 10688 bytes
SHA-256: 57d0df42aed4c601a623bcc8cc9c1bb40eee1d670179ae20029d9e36ada6d9dc

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