Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe2571dd6b168cb6…

MALICIOUS

PDF

72.3 KB Created: 2021-02-15 06:23:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a246a10e81ef9fe000081271b28a315f SHA-1: c7410432d91dbf4209e6bc258f40b80cb4e7c85c SHA-256: fe2571dd6b168cb6ff1bd12be268fef6fff5041b48cd91c646ed3fa1f8f67309
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains multiple external URIs, including one pointing to 'baarspo.ru', which is likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a malicious purpose, as the PDF acts as a link farm hosted on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://baarspo.ru/wix?keyword=letter+t+search+worksheet PDF link annotation
    • https://fagovuwafarawa.weebly.com/uploads/1/3/4/0/134042706/6388654.pdfIn PDF document text
    • http://cmb-eco.com/89794204038m6ag4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495681/normal_5feafbc8a1bf2.pdfIn PDF document text
    • http://help-lnstagramcopyrights-verify.com/86552776413q1wm.pdfIn PDF document text
    • http://bellissimo.online/7491548432326wnx.pdfIn PDF document text
    • https://nexakolaligu.weebly.com/uploads/1/3/1/8/131871479/tukanapuwitov.pdfIn PDF document text
    • https://xinefozi.weebly.com/uploads/1/3/0/7/130775465/719d928dfa78a.pdfIn PDF document text
    • https://jazitilifa.weebly.com/uploads/1/3/1/4/131414561/016a5cb8950c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380530/normal_5fe759a0425b2.pdfIn PDF document text
    • https://bozadabeduli.weebly.com/uploads/1/3/4/8/134869561/gopevosovel-ninafumapemil-gifazolanarof-zawodemo.pdfIn PDF document text
    • http://rewita.fun/62503092780yh225.pdfIn PDF document text
    • https://sudororurupe.weebly.com/uploads/1/3/4/6/134602833/bijafaxexaxik.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/xuzed/android_mobile_recovery_software.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/abrace_seu_filho.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/robifakaminofegamiji.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_off0000dfc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC5 4952 bytes
SHA-256: 538e2ab3808c7b257ab2c2a2c8c53245d90ce803adae36e5be3390a4d6aef801
font_01_sfnt_off0000f0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A8 10504 bytes
SHA-256: 04c71c60a664f6af301eab68c0310c7db335f98ca055cd5bfed31dd66b519912

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