Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7d1306b074591cc…

MALICIOUS

PDF

80.4 KB Created: 2021-02-20 14:52:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b5069e1dc22931053cf9e3afd5759661 SHA-1: c1a1e669267ba94bb8d7d262c44a929277c027d2 SHA-256: f7d1306b074591cc7b8b37a354bc231de218f88fc11bd9d21ed220f1f7c9e8f6
214 Risk Score

Malware Insights

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

The PDF was flagged as malicious by multiple heuristics, including a critical finding for a malicious redirector link and a link farm. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to 'John deere 2650 tractor seat' and 'wkhtmltopdf', suggesting a lure for potentially unsuspecting users. The presence of numerous external links, one of which is a known malicious redirector, indicates an attempt to lead the user to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=john+deere+2650+tractor+seat In PDF document text
    • https://guxumexowe.weebly.com/uploads/1/3/3/9/133999944/6477167.pdfIn PDF document text
    • https://cdn.sqhk.co/zukasedu/jbBhgjh/xcom_enemy_within_android_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/sofilita/iibrjcS/faxinupodipikoteji.pdfIn PDF document text
    • https://zavebunerug.weebly.com/uploads/1/3/4/3/134358754/8b5581dbf8ddb8.pdfIn PDF document text
    • https://cdn.sqhk.co/silinetufid/jYAlmhb/78863530561.pdfIn PDF document text
    • http://copalofa.site/zedge_app_download_play_storeu5tqr.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/gcFzVic/hot_wheels_id_arkham_knight_batmobile.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/bhagavad_gita_in_gujarati_translation.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/34603273033.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/57212835282.pdfIn PDF document text
    • https://s3.amazonaws.com/zatasipezeg/fema_ics_100_answer.pdfIn PDF document text
    • http://tuzasujonumex.epizy.com/aviation_industry_report.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/apa_format_citation_online.pdfIn PDF document text
    • http://putazosaw.epizy.com/avarampoo_arelu_naala_hd_video_song.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_off0000eee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE9 5276 bytes
SHA-256: baf8cd41184cd21c9d335898cc3327a64c1bb913057fd84720088b243dfd6e53
font_01_sfnt_off000100b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B8 11072 bytes
SHA-256: fccaf8d3855f05d7ac87a33324537f7040014288f71f3429f6027b75dfc0b09e
font_02_sfnt_off0001265f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265F 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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