Malicious PDF — malware analysis report

Static analysis result for SHA-256 91251c38a00fd87d…

MALICIOUS

PDF

71.6 KB Created: 2021-03-25 21:19:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f80af9ee8282428e0f97d44f8a84b27e SHA-1: 1a1e1ceb5990f7feab850b494123f82460db21c1 SHA-256: 91251c38a00fd87db3ab5827fba8ce30c06209acda3b3c302bc3aab365100406
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/aws?utm_term=how+to+turn+on+a+polaroid+is048
    • http://budivev.scienceontheweb.net/5798699878.pdf
    • https://dexekuweda.weebly.com/uploads/1/3/4/7/134705305/687eca5f.pdf
    • https://mazegiwekode.weebly.com/uploads/1/3/4/5/134529082/nadika.pdf
    • https://fulotagefopag.weebly.com/uploads/1/3/1/8/131857199/sipofodaku-ragazudumep-tikodogore-futita.pdf
    • http://kobivoweder.mypressonline.com/agriculture_class_10_notes.pdf
    • http://jinevul.mygamesonline.org/what_is_1_million_in_standard_form.pdf
    • http://tadezutalowebe.22web.org/nujekesi.pdf
    • http://zizaburixakog.iblogger.org/9271522491.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mukanebesiva.atwebpages.com/how_to_be_a_good_pastors_wife.pdf
    • https://1f2f8e77-98df-4c5e-b88a-83bc2b612b58.filesusr.com/ugd/5c7528_e2aa0594e3544e959988797f85fe90a3.pdf?index=true
    • https://39c10a3a-92c6-412a-a1bb-b8a1fc48fbc4.filesusr.com/ugd/259099_e10ba5ee4c0d496bbedb84d13c067dd7.pdf?index=true
    • http://zujisofivo.onlinewebshop.net/artificial_intelligence_for_beginners.pdf
    • http://jefokilekik.rf.gd/arminian_systematic_theology.pdf
    • http://jamivofobo.rf.gd/chikati_gadilo_chithakotudu_movie_video_songs.pdf
    • https://bd15da75-ee01-4ad3-8b22-4778d9929f37.filesusr.com/ugd/1abc29_1350fe4c0d234670af62d633e6e39aad.pdf?index=true
    • https://acda325f-ee3b-40e4-882f-fabc489a6840.filesusr.com/ugd/23b3d3_06faee95ac8b4de58c2528cbc54e00e2.pdf?index=true
    • http://deribojuzirapa.rf.gd/my_electric_fireplace_remote_not_working.pdf
    • http://pilejifizodan.onlinewebshop.net/90133056648.pdf
    • http://wugetad.myartsonline.com/kivunazaletexosuxuxajub.pdf
    • http://gagutaxu.rf.gd/fibe_tv_channel_guide.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dad2.bin
6aac99a2d5b480d7fc4078eff62b00df78e8727294175d6a6b1e6d909394169b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD2 5432 bytes
font_01_sfnt_off0000ed68.bin
e8b40cff96f460499f0298e388a17dc98fa200853867bfb854abf40cbd1f2ab5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED68 10336 bytes

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