Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c92836f1119fad…

MALICIOUS

PDF

62.8 KB Created: 2021-01-06 19:52:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0c6510545b54a1b30ea4932233950006 SHA-1: e454197f63188096eee37150fa6f780c055ebf28 SHA-256: c8c92836f1119fad84c2b936ab4ff264484f92a4090a22eed2ce318a0132e1aa
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, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. One notable URL is https://traffnew.ru/aws?utm_term=saki+saki+song++mp4+dj, which appears to be a lure related to search terms.

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
  • 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://traffnew.ru/aws?utm_term=saki+saki+song++mp4+dj PDF link annotation
    • https://jepopiravu.weebly.com/uploads/1/3/4/1/134131497/sivemifigiruloboj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467298/normal_5fdafdbd7d8cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383295/normal_5fcad48bd9e0a.pdfIn PDF document text
    • https://romidanunopupef.weebly.com/uploads/1/3/1/1/131163616/932cf7ac50a4.pdfIn PDF document text
    • https://lenagalazipanom.weebly.com/uploads/1/3/5/3/135310064/9439476.pdfIn PDF document text
    • https://nemaxalifaxibox.weebly.com/uploads/1/3/4/6/134627725/wejilulogaj.pdfIn PDF document text
    • https://kabijibijeg.weebly.com/uploads/1/3/4/9/134900291/ranalexegiwedajem.pdfIn PDF document text
    • https://bivapere.weebly.com/uploads/1/3/4/6/134689139/mofilutalile_gewibawu_jixolo.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/jodabiladezot/destructor_c_template_class.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6b2ae3b-4266-45ff-ad0c-d5d523296a6c/shoulder_holster_pattern.pdfIn PDF document text
    • https://s3.amazonaws.com/mosezavor/fanuvotomeve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19586a1e-caa6-4766-ac8d-25ef6c1f5b8d/82043598623.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c57cd8e-775a-4ebd-bcd2-a302980407c0/buddhism_worksheets_6th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fa9bce8-6132-412a-afc3-9ec0fe05cc85/mixijik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1faa742-1c9c-49b3-846f-80ab9945eb85/atividades_sobre_a_unificao_italiana_e_alem_8_ano.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D1 5480 bytes
SHA-256: 7afd2452f6671bd461e60088d64b67f43442b2246ece0b824b08bab72e3324f3
font_01_sfnt_off0000cb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7A 10500 bytes
SHA-256: c2c730cea972086ad6297bebd25c407278ce8fca5ce1e069751d6c41c575d2b9

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