Malicious PDF — malware analysis report

Static analysis result for SHA-256 a88bbf48af911992…

MALICIOUS

PDF

70.6 KB Created: 2020-11-20 09:44:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34955d09d771efdc08e4a47fc6b3194e SHA-1: 1bd2dd3d53c8097a1e801008179bc72d20494bef SHA-256: a88bbf48af911992734b5da2e144d4149539d7a9f1e88b93e50c6e0f6737c475
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier, exhibiting characteristics of a phishing or malware distribution campaign. The PDF contains a large number of external links, many pointing to other PDF files, suggesting a link farm designed to obscure malicious activity. One of the primary external links is to 'trafffi.ru', which is likely part of the distribution infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffi.ru/aws?utm_term=bubble+vector+free
    • https://cdn-cms.f-static.net/uploads/4412394/normal_5fa0940937989.pdf
    • https://fisotewefupug.weebly.com/uploads/1/3/1/0/131071176/3076105.pdf
    • https://cdn-cms.f-static.net/uploads/4419441/normal_5fa0ec4855ff5.pdf
    • https://robavefozaxun.weebly.com/uploads/1/3/4/3/134379548/wasox-savonokitosonol-fegopanoj.pdf
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/jinitorip-bolag.pdf
    • https://cdn-cms.f-static.net/uploads/4386354/normal_5f8e55c9ce32f.pdf
    • https://jatasurow.weebly.com/uploads/1/3/4/3/134358583/02072ad394317.pdf
    • https://femevidawivuk.weebly.com/uploads/1/3/1/0/131071063/lajav_ramipomubevit.pdf
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/jogowezokuvaxu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rufonali/69811432607.pdf
    • https://s3.amazonaws.com/jinabisura/setool_setup_crack.pdf
    • https://uploads.strikinglycdn.com/files/a31711ab-76eb-46a4-a109-c536324991ed/gafuxawajuki.pdf
    • https://uploads.strikinglycdn.com/files/e1f0554b-dc9c-45f0-bc34-907a54d9e774/68402426517.pdf
    • https://s3.amazonaws.com/mipizaju/bujamag.pdf
    • https://s3.amazonaws.com/dumupa/fanixemiwoxekoxelo.pdf
    • https://s3.amazonaws.com/tojazudibumogab/factors_affecting_workability_of_fresh_concrete.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dded.bin
ba6f81b5d4b00e27c2b3cec06bd3637fb2b5134ef5029e624e6b047376cf223e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDED 4736 bytes
font_01_sfnt_off0000ee24.bin
db07facc5c187adcae6adc1574fd67db3461f431436044e7c77d4c7a61a14a8f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE24 9440 bytes