Malicious PDF — malware analysis report

Static analysis result for SHA-256 37b1a4276986773d…

MALICIOUS

PDF

72.1 KB Created: 2021-01-03 15:35:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c388a26a45b27f3ad3ce2ca16bd8a6f6 SHA-1: 71a9b2b52784599f6361fd21818b0cbbfd48b186 SHA-256: 37b1a4276986773d1ae85872c3b90c2eec6b3a236c355c752c9818d03b7280e1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The primary URL, 'https://trafficel.ru/123?utm_term=a+house+for+hermit+crab+activities', suggests a phishing or malicious redirection attempt. ClamAV detection and ML classification further support its malicious nature, indicating it's likely a phishing or trojanized document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://trafficel.ru/123?utm_term=a+house+for+hermit+crab+activities PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416128/normal_5fc0920a7cd83.pdfIn PDF document text
    • https://lerexujirizafet.weebly.com/uploads/1/3/4/3/134344290/tavebetubavu_gozifiniguvo_zuxizowagax_xavegogewodilep.pdfIn PDF document text
    • https://tijukubi.weebly.com/uploads/1/3/4/4/134458902/4469358.pdfIn PDF document text
    • https://nuresoxak.weebly.com/uploads/1/3/1/3/131380504/janofezonus-dobeloxeser-rajeruda-tizagafamaroko.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459926/normal_5fcebad879e7a.pdfIn PDF document text
    • https://zewogamiwivu.weebly.com/uploads/1/3/4/3/134313422/1585528.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468836/normal_5fdf92ebb65ad.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/sibenuvokiwuz/2016_ap_microeconomics_free_response_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/alaine_rise_in_love.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/wokutovifefibagav.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/adobe_character_animator_cc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d30a434-a2c0-4ab0-9753-c62cebbe43dd/87649372965.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_off0000da5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5C 5276 bytes
SHA-256: 7bf3ec4cdfa975ade0196d626bf2aa357e2a8435ac2158710265898aa4d4a2cc
font_01_sfnt_off0000ec2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2F 11996 bytes
SHA-256: c1b270df2c7e319c31d23792ae339143b6966479c1ae1f581ab88158b2a639d3

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