Malicious PDF — malware analysis report

Static analysis result for SHA-256 7959b8f9c4133e3a…

MALICIOUS

PDF

67.0 KB Created: 2021-01-10 06:58:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 6e5132d5d42eeb26f2d0ee58ff643571 SHA-1: ea5b8f2ebb2279bc46561864800f958e774bb08c SHA-256: 7959b8f9c4133e3a73eeaebb75ce372a95db5c70b7641bc7644325fbc46cc3e4
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URL `https://trafficel.ru/123?utm_term=onslow+county+jail+jobs` indicates a potential lure related to job searching. The PDF structure and link farm behavior are consistent with attempts to redirect users to malicious sites for further exploitation or credential harvesting.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/123?utm_term=onslow+county+jail+jobs PDF link annotation
    • https://xanodupujariris.weebly.com/uploads/1/3/0/9/130969381/75de7.pdfIn PDF document text
    • https://setisobizosepi.weebly.com/uploads/1/3/4/6/134670504/lekodizefutad-mapoz-bitivarejadi.pdfIn PDF document text
    • https://levibezime.weebly.com/uploads/1/3/3/9/133986639/pegil_buvigamevorami_wobazekimoveseb.pdfIn PDF document text
    • https://site-1178749.mozfiles.com/files/1178749/sonic_adventure_2_soundtrack.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410030/normal_5f9ae4dd9a705.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426279/normal_5f9ad1feb348d.pdfIn PDF document text
    • https://site-1181076.mozfiles.com/files/1181076/answers_4_pics_1_word.pdfIn PDF document text
    • https://site-1177226.mozfiles.com/files/1177226/zesop.pdfIn PDF document text
    • https://mogidudurunupiz.weebly.com/uploads/1/3/2/6/132695636/rijeseka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411219/normal_5fe66299c8fee.pdfIn PDF document text
    • https://site-1214400.mozfiles.com/files/1214400/secret_files_tunguska_wii_u.pdfIn PDF document text
    • https://vosasavowaje.weebly.com/uploads/1/3/4/5/134587316/pitiwejivorazes-nolufogetaso-romaro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB6 5136 bytes
SHA-256: f6a7fc84a953846cd7eb67f881da48b85f7a92788f0d6888aacf170e27b33cd9
font_01_sfnt_off0000dc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5A 10240 bytes
SHA-256: 6ea735bcf244d9dc4b1490f02f5492a1a7c09b2f18c8ebaffe5c24850acdb213

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