Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0537c2854da10fe…

MALICIOUS

PDF

76.5 KB Created: 2021-04-02 02:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 669fe20d50bdfbe528de442a8b0f19fa SHA-1: 18e0339a4048c2b2774dd10483d0f05f0554003e SHA-256: e0537c2854da10fe7b4fbf0ee7ae64ef4263dfa024262029166669fd40e537d2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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://jacksth.ru/123?utm_term=steel+cord+conveyor+belt+specification+pdf PDF link annotation
    • https://sibevuguz.weebly.com/uploads/1/3/4/8/134859718/1598205.pdfIn PDF document text
    • https://nexudusuje.weebly.com/uploads/1/3/0/7/130740550/1871530.pdfIn PDF document text
    • https://xowilululevala.weebly.com/uploads/1/3/4/0/134017879/55bc4a.pdfIn PDF document text
    • https://tiramanab.weebly.com/uploads/1/3/1/8/131856622/7c2746ec884cf6.pdfIn PDF document text
    • https://nivunosanogerog.weebly.com/uploads/1/3/4/5/134516177/wedebaju.pdfIn PDF document text
    • https://xijegubusogo.weebly.com/uploads/1/3/0/7/130739006/lagokopid-kojamu.pdfIn PDF document text
    • http://wedejopejujotu.iblogger.org/87045058940.pdfIn PDF document text
    • https://detosujedeke.weebly.com/uploads/1/3/4/3/134371576/2560701.pdfIn PDF document text
    • https://majurunonixo.weebly.com/uploads/1/3/1/0/131070356/949164bb7d63.pdfIn PDF document text
    • https://puganijososas.weebly.com/uploads/1/3/1/8/131871778/b03c7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a0d2adcf-75bd-42a9-a42a-c23e1c6e9e1a.filesusr.com/ugd/85c99c_692466b1b41a48b79598a5fc27abeb9a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/88889502733.pdfIn PDF document text
    • http://soxenaroguz.rf.gd/platform_account_executive_salesforce_salary.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/30562720181.pdfIn PDF document text
    • http://xeroxofebamuwu.rf.gd/34893250867.pdfIn PDF document text
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_5ea8312f93144c508c1d72336ff7febc.pdf?index=trueIn PDF document text
    • http://posowisame.epizy.com/the_red_badge_of_courage_study_guide_answers_mcgraw-hill.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/32275096858.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1f5d24e-f297-41de-ba37-35f004e2271a/hitachi_c10fce2_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a498dcc2-4f7f-4300-85ad-87682d6fa64c/28829781708.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16603dfd-1d39-4db9-b956-ccbcef8dbdfa/dyson_dc50_manual.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_off0000ecf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF1 5552 bytes
SHA-256: 04d3b7b06bd54a028c4a09c85fab15924cd375fb48d85b8be6d5f611f8fcbf0d
font_01_sfnt_off0000ffe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE4 10688 bytes
SHA-256: e8408301bd99ce3b9d53ca8dc651c59e658037cd0dca9174d629eff3ecc06315

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