Malicious PDF — malware analysis report

Static analysis result for SHA-256 aea79f13a2167ce8…

MALICIOUS

PDF

66.2 KB Created: 2020-12-18 08:20:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: eeeb3c8f7776ae00dd0d5af6ad0649e6 SHA-1: 96e806422bf1dd757ab16eb0fb2ba26fe0cd36da SHA-256: aea79f13a2167ce87dffc15a62e368ff90ba615862da1eb299593887b22de877
216 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including brand-impersonation credential phishing and a link farm. The presence of numerous external links, some pointing to redirectors and others to potentially malicious PDFs, indicates an attempt to lead the user to harmful content. The ML classifier and ClamAV detection further support its malicious nature, suggesting it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://satizivuzaked.weebly.com/uploads/1/3/4/3/134383512/4005713.pdf.
  • 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://trafffe.ru/123?utm_term=pre+ap+biology+final+exam+study+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4477400/normal_5fcb8d94a95e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443804/normal_5fa74d3912f6b.pdfIn PDF document text
    • https://satizivuzaked.weebly.com/uploads/1/3/4/3/134383512/4005713.pdfIn PDF document text
    • https://lubuminovek.weebly.com/uploads/1/3/4/5/134590555/manasexatowafex-jumubibaven-pikitafura-gebinujoro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369765/normal_5fa15ba577852.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416666/normal_5f9a077d30860.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417128/normal_5f9ae7fe7ea40.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a95a132-172b-4795-b8da-d90ef1e71c0f/68848142985.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07ec96dc-0674-4a1d-9a8f-1dc76ce74165/comparing_fractions_super_teacher_wo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0d41c8d-72d8-42d2-b9a4-b4eb3bda8ac1/zakomomanowibu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc0f2f52-76dc-44a6-8439-6152b7fb12d5/nojegajanenoponos.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_off0000c58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58B 5672 bytes
SHA-256: bbb5bc7149df7a4a898cebb136ac292a429a8e841b0ba187b23b221bdea4cb9f
font_01_sfnt_off0000d8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D6 10408 bytes
SHA-256: 9d75e352433e2f0188b3a05540863e1cc6f8fa92226f68202d4e72c61680867b

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