Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e8fa65012ab4e9d…

MALICIOUS

PDF

72.7 KB Created: 2020-11-17 04:01:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 010c276ea504d5704d8a1119836a69ce SHA-1: 24ce37853aa7db183ede6cbd2a6f6d5054e63706 SHA-256: 1e8fa65012ab4e9de7d65b4029418e0ed3b5e7d59f9d0c42365547911a06b2f8
214 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain metadata related to link generation, suggesting a link farm or SEO abuse tactic to distribute malicious 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://traffking.ru/123?utm_term=butte+creek+falls+camping In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368767/normal_5f929874cfb80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408176/normal_5f9611539aa70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383170/normal_5f93e0362e168.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366043/normal_5f8940ca73cdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379371/normal_5f96fbf6a1052.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387589/normal_5fa6e06b7b58a.pdfIn PDF document text
    • https://nijubalalo.weebly.com/uploads/1/3/1/4/131453980/6177542.pdfIn PDF document text
    • https://folukufisika.weebly.com/uploads/1/3/1/3/131384255/d41a80ef933e7be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369776/normal_5f8827d7e3a8e.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/biwuwukesazef/24040344256.pdfIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/crazy_pixel_apocalypse_unblocked_games_66_ez.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/zeniwobilemiwuwibuti.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/zalikuwuzito.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/cricut_manual_explore_air_2.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/december_2017_calendar_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/9951504295.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_off0000e00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00E 5448 bytes
SHA-256: 78b33caec894776b65b45576138d55ba9f5da5334db25a42502487d317a5179f
font_01_sfnt_off0000f289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF289 10368 bytes
SHA-256: 291bd284c18f4689330d3b725cc6ccdfbeaf81bc943512216cac2410408f7939

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