Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd54bec3aa99cdc2…

MALICIOUS

PDF

106.8 KB Created: 2020-12-27 03:22:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c3db4dc516239bea5231d8292bd0df5f SHA-1: e6f99d80aa356016c8bc52c641824a4b6ff8b77b SHA-256: cd54bec3aa99cdc27bdecf237c3bfe8973f2f5c37006d8eafe085ae776dddce1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or distribution mechanism. ClamAV and ML classifiers strongly indicate maliciousness, with a specific detection of 'Pdf.Phishing.Trojan'. The embedded URLs suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

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://traffine.ru/aws?utm_term=applied+management+science+pdf PDF link annotation
    • https://kixovomez.weebly.com/uploads/1/3/4/8/134868331/4d37681c61305e.pdfIn PDF document text
    • https://rinedasufuketon.weebly.com/uploads/1/3/4/3/134340565/1445272.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409239/normal_5f93a38961c00.pdfIn PDF document text
    • https://gasodugolulo.weebly.com/uploads/1/3/4/3/134375537/ab07a.pdfIn PDF document text
    • https://xirovule.weebly.com/uploads/1/3/4/7/134749068/0befcf8a487613.pdfIn PDF document text
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/3471586ae14859.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/vonuxagupeduze/74493841879.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/xifutazidativor.pdfIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/kumon_math_worksheets_for_grade_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bda90a69-f07e-41ce-955c-5357195fe402/leyenda_del_cadejo_de_miguel_angel_asturias.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/150ac08e-edb8-475a-a0cf-ec86fd15ce3a/97518489565.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_off000166e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166E4 5368 bytes
SHA-256: 10359f528938ba7408ec94b8c837e919656cf17a04c5671a0e5f0aa2482b2244
font_01_sfnt_off0001791d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1791D 11000 bytes
SHA-256: 63aa0e733f20aafd933973849987a27b99cfd15ac52368f960dee72b9d0512d6

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