Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef09098465606e9…

MALICIOUS

PDF

90.7 KB Created: 2021-03-13 19:07:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd15f15a824934233706b2e4b529d541 SHA-1: 70ac18eb5fb8ea7f9c55d86105ffa540337bfb48 SHA-256: 3ef09098465606e94a41204da88c52fa92c47ab643d5010591cbf3baa0ce0bb4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with the heuristic 'PDF_SEO_LINK_FARM' indicating a large number of these links are generated for SEO purposes. The primary URL, 'https://jumiwimov.ru/wix?keyword=holt+mcdougal+mathematics+grade+7+workbook+answers', suggests a lure to disguise malicious content as educational material. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. No scripts were extracted, but the extensive link farm points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/wix?keyword=holt+mcdougal+mathematics+grade+7+workbook+answers
    • http://jepatugikanoxuv.iblogger.org/installation_guide_arch_wiki.pdf
    • http://zizopeja.22web.org/inadvertent_disclosure_form.pdf
    • https://cdn-cms.f-static.net/uploads/4501980/normal_6017f7f2a4254.pdf
    • https://static.s123-cdn-static.com/uploads/4417327/normal_5fec0f34bbf93.pdf
    • https://cdn-cms.f-static.net/uploads/4365621/normal_6013ba8d554e5.pdf
    • https://cdn-cms.f-static.net/uploads/4367640/normal_600a126ace1a6.pdf
    • https://cdn-cms.f-static.net/uploads/4495034/normal_6039b2a989e9a.pdf
    • https://cdn-cms.f-static.net/uploads/4424036/normal_6014ff4b1ff2a.pdf
    • https://deremufirig.weebly.com/uploads/1/3/4/8/134854029/519b74a58865.pdf
    • https://cdn-cms.f-static.net/uploads/4480382/normal_603852c121add.pdf
    • https://finijigif.weebly.com/uploads/1/3/2/6/132681422/c6aa7c6d1e.pdf
    • https://vufujisuwe.weebly.com/uploads/1/3/1/4/131437295/getopakedev.pdf
    • https://guferewefozitak.weebly.com/uploads/1/3/4/3/134393558/gunilixide.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/vosimalume/shark_navigator_xl_upright_vacuum_reviews.pdf
    • https://uploads.strikinglycdn.com/files/a4c813af-bf30-4eaa-bf34-7b13f9317c2d/dungeons_and_dragons_monster_manual_5e.pdf
    • https://s3.amazonaws.com/mikibetiv/how_atm_machine_works_technically.pdf
    • http://nemejubazabok.rf.gd/derixupanijasixe.pdf
    • http://vizulubafaxal.epizy.com/kokawuletopunen.pdf
    • http://daguvagobilat.rf.gd/lipifakotololi.pdf
    • https://uploads.strikinglycdn.com/files/17f7d355-af83-45fe-847c-b5fb7fbc062b/77682332002.pdf
    • https://s3.amazonaws.com/mukut/70606046285.pdf
    • https://s3.amazonaws.com/naxizugenabi/kivepe.pdf
    • https://s3.amazonaws.com/sowirutelevolur/animal_sounds_esl_worksheet.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114e5.bin
21a0f7bcc69429e162c8bd4482712fbd8c85ff6b82a035d0a5a3dc1f765d706f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114E5 5572 bytes
font_01_sfnt_off000127c3.bin
b6038e8f15b6aea1ba43f60078448ef96ea894c1af060ab2a55ba73ba89d5bff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127C3 11608 bytes
font_02_sfnt_off00014ebc.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14EBC 4324 bytes

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