Malicious PDF — malware analysis report

Static analysis result for SHA-256 7564ae13784c81b0…

MALICIOUS

PDF

68.8 KB Created: 2021-02-13 23:14:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ddb60e44d03263af8017ed7c52be636c SHA-1: 4669587658272eea5138a1a9596864c88b990a33 SHA-256: 7564ae13784c81b0da1692f9e5f4179db6ac9de1aa5bb2e8bf5d08513eebf49d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links pointing to PDF files hosted on various domains, including disposable ones. The primary purpose appears to be directing users to potentially malicious content or phishing sites, indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics.

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://jottigo.ru/aws?utm_term=transformation+chimique+physique+ou+melange PDF link annotation
    • https://cdn.sqhk.co/jisaside/Ajbgh82/44058086081.pdfIn PDF document text
    • https://lapedifulijep.weebly.com/uploads/1/3/0/7/130739603/a5b032d9ad36f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445735/normal_5ff6c11f96bfd.pdfIn PDF document text
    • https://cdn.sqhk.co/balatexoriv/hb2aicU/wordscapes_level_8529.pdfIn PDF document text
    • https://zadobezaja.weebly.com/uploads/1/3/0/7/130775221/234f960.pdfIn PDF document text
    • http://vijuziruzunubiz.iblogger.org/bsc_mathematical_methods_notes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449965/normal_5ffc0a4a01fb3.pdfIn PDF document text
    • https://wafiludelo.weebly.com/uploads/1/3/1/4/131437380/140da9243d5c.pdfIn PDF document text
    • https://kaxojolomo.weebly.com/uploads/1/3/4/8/134885197/8159985.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418013/normal_5fda21f055f7e.pdfIn PDF document text
    • https://sujanumijixedi.weebly.com/uploads/1/3/4/5/134501714/4668b7af.pdfIn PDF document text
    • https://kazajibabagak.weebly.com/uploads/1/3/4/4/134467412/1126057.pdfIn PDF document text
    • https://lisogawe.weebly.com/uploads/1/3/5/3/135312855/9827337.pdfIn PDF document text
    • https://cdn.sqhk.co/jukusenefow/Sijjim9/11063345622.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zudosikewemer.epizy.com/tisuvariwilinujasinad.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_off0000cdf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF8 5608 bytes
SHA-256: 9456dfab2b7dc6e558728d06d447827e320844684c3f4dc61fbc218e88657d1b
font_01_sfnt_off0000e0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E6 11460 bytes
SHA-256: 9ac555369f7720bd839448e06c37eb6f771cb6e9b2bc9c89f7bcc1aaca84116c

Open this report in the interactive analyzer, or submit your own file for analysis.