Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a1d0b4dd6404e1…

MALICIOUS

PDF

83.8 KB Created: 2021-03-16 00:41:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3a91f340150f2adb831f8cc5a4323f71 SHA-1: 51717d97b990c9c1f6deecfa5e4692a13cb22637 SHA-256: a9a1d0b4dd6404e106e7157ef77da2c35a0aaeb7f51a48dc019ef3e93762ffdf
186 Risk Score

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 0.9993

Heuristics 6

  • 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.
  • 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://resalured.ru/wix?keyword=dragon+mania+breeding+guide PDF link annotation
    • https://xudinenudomojuv.weebly.com/uploads/1/3/4/3/134356320/aa976b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453537/normal_5fdacb18cd294.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443598/normal_601487e243362.pdfIn PDF document text
    • https://motubisirewu.weebly.com/uploads/1/3/4/5/134529252/9933611.pdfIn PDF document text
    • http://tijudozi.scienceontheweb.net/crazy_stupid_love_hulu_netflix.pdfIn PDF document text
    • http://suzamajotibe.mywebcommunity.org/foxeba.pdfIn PDF document text
    • http://vasugixoba.22web.org/method_of_preparing_projected_balance_sheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463002/normal_6011e510e316f.pdfIn PDF document text
    • https://pubasozivo.weebly.com/uploads/1/3/0/8/130813448/gofogiwunabasar_zamenefuvuresa_gofukeraxak_fupofir.pdfIn PDF document text
    • https://bukusafirede.weebly.com/uploads/1/3/4/2/134266240/20bd76d4f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477163/normal_6042c9b3c67a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488570/normal_60350bca9b669.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rujujarorimepa.rf.gd/todays_a_great_day_gif.pdfIn PDF document text
    • https://cdb53ace-3f3f-41e1-823e-0ecf3add8ba2.filesusr.com/ugd/47e9e0_b96c68a67b4e4d4a83cd5bf798276b42.pdf?index=trueIn PDF document text
    • https://d1ced4a1-fa29-4c66-b583-77209f32159a.filesusr.com/ugd/c88d8b_b3843753902e45598e41ff1041f4a09b.pdf?index=trueIn PDF document text
    • http://felugibesixe.onlinewebshop.net/bedrfnisse_gfk.pdfIn PDF document text
    • https://882e4f53-a7e1-4d4a-89e8-a6e6d9f9b805.filesusr.com/ugd/9a13d2_2ed778b1e40d4a7fac31af1ae3b23ae1.pdf?index=trueIn PDF document text
    • http://sijurajogo.epizy.com/nomofogegomojaromuzelulig.pdfIn PDF document text
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_d242bd33334b481c81bd61a6929a592d.pdf?index=trueIn PDF document text
    • http://sudexixurijaxoz.atwebpages.com/academic_journal_guide_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/alien_shooter_2_mods.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/hepatology_practice_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/165016778.pdfIn PDF document text
    • https://0b21792c-a699-4cf4-8833-5910c6ad58af.filesusr.com/ugd/b0b521_695e9d9128de442bae57b27aa7813831.pdf?index=trueIn 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_off00010a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A38 5076 bytes
SHA-256: 9c0d0f2b4c4fb36b7e90c010cfa7b0f9e67b97e4f0d911ff0f6e2d552bd8bf80
font_01_sfnt_off00011b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B67 11312 bytes
SHA-256: 33db09a335a527f22532ddccf7d5ceb0e6490046e8b4bbe0933522551b5e081f