Malicious PDF — malware analysis report

Static analysis result for SHA-256 8294aa8ffc533e1d…

MALICIOUS

PDF

87.8 KB Created: 2021-02-13 09:12:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 581b6d083318fa2a144a0a9e9067c6c1 SHA-1: 2e89840bd45bd0576d60d0b802fa08992e14457d SHA-256: 8294aa8ffc533e1d7c767daf13607cd04e5abad6a02793f25674ce49157ff600
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. While no scripts were explicitly extracted, the presence of numerous external URLs suggests an attempt to redirect users to potentially malicious sites.

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://crophysi.ru/123?utm_term=angle+between+two+vectors+unity PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4458431/normal_5feb321e55766.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448110/normal_5fe4c419053b3.pdfIn PDF document text
    • https://ronumotesagazuw.weebly.com/uploads/1/3/4/3/134373959/6cad73587eac618.pdfIn PDF document text
    • https://cdn.sqhk.co/dopuwene/gbhihgV/megan_fox_and_machine_gun_kelly_age_gap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406775/normal_5ff08da2d1223.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372735/normal_5fe024008e3d5.pdfIn PDF document text
    • https://cdn.sqhk.co/noviraxat/giY9ib0/vadojikodibazinok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447093/normal_5fef85952adf4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468294/normal_5fe7989746e4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484807/normal_600a704d6d759.pdfIn PDF document text
    • https://cdn.sqhk.co/fejavegiwo/fWYmMhi/wibovataluxoseva.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwoxebu/cSPS8nn/pujujameliwuvovaxi.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/rudelazifizuvo/mirutidigutezo.pdfIn PDF document text
    • http://judowasejalux.rf.gd/plague_bearer_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/8686139419.pdfIn PDF document text
    • http://litegizixusiw.rf.gd/raluxa.pdfIn PDF document text
    • https://s3.amazonaws.com/legobegutulo/bobcat_e45_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/37477410297.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10296 5140 bytes
SHA-256: 9f115b14df45315845fb478d479ee0dd03c5428be03491c42b05246e0a0c6c32
font_01_sfnt_off0001144b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144B 11556 bytes
SHA-256: b9e157763a47af82efdbf66f98762f71a99cba3d732d00839379045fbfbbf622
font_02_sfnt_off00013bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFF 16148 bytes
SHA-256: 8d9dcbf38a752c1c96d3770aa054678c7155d16a16dd1c3f21d5d9349a2d6a6e

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