Malicious PDF — malware analysis report

Static analysis result for SHA-256 371c47a63a349322…

MALICIOUS

PDF

79.5 KB Created: 2021-01-11 02:54:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: eb0854c62491005789181ef674084dab SHA-1: c3d943d193b09471b0fca7813d8f0fad7ce08ca6 SHA-256: 371c47a63a349322a52aa65cc3450dc6b500d3abf62c5f755a53f3be61c6d2c5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, contains text related to finding areas between curves, which is likely a lure to disguise the malicious intent of redirecting users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffking.ru/123?utm_term=find+area+between+two+curves+online PDF link annotation
    • https://ditiwudo.weebly.com/uploads/1/3/1/4/131452947/kanawinadinaw_vaditi.pdfIn PDF document text
    • https://site-1177476.mozfiles.com/files/1177476/10187411030.pdfIn PDF document text
    • https://tovigaxibikufa.weebly.com/uploads/1/3/4/8/134875165/b857b91884219.pdfIn PDF document text
    • https://site-1176407.mozfiles.com/files/1176407/41464982529.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408483/normal_5fe5369b3ca09.pdfIn PDF document text
    • https://site-1196011.mozfiles.com/files/1196011/libro_robotica_para_nios.pdfIn PDF document text
    • https://site-1178256.mozfiles.com/files/1178256/85178666666.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492259/normal_5ffaa58bd07d2.pdfIn PDF document text
    • https://rojusonevupa.weebly.com/uploads/1/3/0/8/130814232/5047218.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/1a27643b41869.pdfIn PDF document text
    • https://janunawavi.weebly.com/uploads/1/3/4/3/134314220/sigedumokad.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/pidufozu/61069355937.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/baseball_uniforms_wholesale.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEC 5180 bytes
SHA-256: 0e81164b80066b247d931100111acffc7fc498f4b4d52c06ff2df511ab51adcb
font_01_sfnt_off0000f0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B0 12660 bytes
SHA-256: 3b3e81aa6242ada9a4f6a430702b178974e4cb24f76811eda3b8041ffbc1079c
font_02_sfnt_off00011bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBE 16080 bytes
SHA-256: a534b91c4ec3d8756e3a834051570443c69e75f38d6508a28567570861ffac3d

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