Malicious PDF — malware analysis report

Static analysis result for SHA-256 103a9319f4068fee…

MALICIOUS

PDF

77.0 KB Created: 2020-12-25 06:33:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 132de9b7550b997c094714bc40fe1ccb SHA-1: 97b636289463df54f5cc30db703dff9715b8a6aa SHA-256: 103a9319f4068fee6fa0b5365f731125ff836d411a98f59740b7ed8bfb45628d
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a high-confidence ML classifier. The document contains a large number of embedded URLs, many of which point to disposable hosting or unknown reputation sites, suggesting a link farm designed to distribute malicious content or phish users. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly indicate an attempt to lure users to malicious sites, likely as part of a phishing or malware distribution campaign.

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
  • 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://traffking.ru/strik?utm_term=dialer+systems+for+collections In PDF document text
    • https://cdn.sqhk.co/zenetofuma/0hgQLm7/fididoraxom.pdfIn PDF document text
    • https://tijogarukaro.weebly.com/uploads/1/3/4/7/134710746/jinuse.pdfIn PDF document text
    • https://wotewaga.weebly.com/uploads/1/3/4/6/134615540/jemafiduw-nojibotasak-fufowebis-xewaled.pdfIn PDF document text
    • https://cdn.sqhk.co/pujapipiwat/DgiiShj/69442067115.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxikinanibu/G7uvxjb/cross_linking_surgery_cost_in_south_africa.pdfIn PDF document text
    • https://nidixinaxob.weebly.com/uploads/1/3/0/7/130739699/8706678.pdfIn PDF document text
    • https://nonuvatemex.weebly.com/uploads/1/3/4/4/134443968/bepotajurokibodib.pdfIn PDF document text
    • https://jizufozerujit.weebly.com/uploads/1/3/4/3/134343201/1421914.pdfIn PDF document text
    • https://bipinutafo.weebly.com/uploads/1/3/4/3/134358532/6176595.pdfIn PDF document text
    • https://cdn.sqhk.co/sononipo/ehfghjb/gilogalipelupa.pdfIn PDF document text
    • https://cdn.sqhk.co/zawatilirip/QerJnge/gexopukegakewaselovifeja.pdfIn PDF document text
    • https://winugemu.weebly.com/uploads/1/3/1/0/131070294/8634976.pdfIn PDF document text
    • https://cdn.sqhk.co/kuxefoxo/4oijGDm/zalozobewidufadojelago.pdfIn PDF document text
    • https://cdn.sqhk.co/bonidanem/giU9ide/starfall_calendar_october_2013.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/2e647097-4906-4a9a-8e91-cc19bad48858/philosophical_thinking_about_death_and_dying.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/android_9_notification_sounds_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe1f8b58-1496-4ca6-ad4c-ab6e5c9f3660/nakizunixigokoperotat.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/83980108829.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_off0000f055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF055 5128 bytes
SHA-256: 88607934396af4b1832e89311254f816b45ab6c3acbf7a4eb43311c5c82e74cd
font_01_sfnt_off000101c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C5 10840 bytes
SHA-256: d212a1185fe3c84617cbba23852e801957fe81964ba9cd24258385cd3116fc4e