Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc7b505aaa30a08…

MALICIOUS

PDF

82.2 KB Created: 2021-05-12 09:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0ef6fea84d21925bd5a9faabb43bb8d2 SHA-1: 8b3b0858a4917c23b56d8f879eed4bd155c55bbe SHA-256: ffc7b505aaa30a08b7302265fdc4a74f655b1ed58283f316361c3b25f12db710
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 0.9994

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://vilenefex.ru/strik?utm_term=how+many+interests+should+a+person+have PDF link annotation
    • http://nelodagavezes.mygamesonline.org/zuxanefap.pdfIn PDF document text
    • http://vemiwegar.iblogger.org/24983249790.pdfIn PDF document text
    • http://mazikopipovix.mywebcommunity.org/42597685059.pdfIn PDF document text
    • http://naturelofo.mypressonline.com/92056764791.pdfIn PDF document text
    • http://parazepurafeza.medianewsonline.com/how_to_become_a_registered_vet_tech_in_california.pdfIn PDF document text
    • http://rujawobezixevib.iblogger.org/steam_room_stories_the_movie_parents_guide.pdfIn PDF document text
    • http://3bureaureport.info/c_book_free_onlinerscju.pdfIn PDF document text
    • http://topcreditreport.info/diy_hidden_gun_cabinet_planskja9w.pdfIn PDF document text
    • http://universe1.space/vagakt98am.pdfIn PDF document text
    • http://gusevoxuzuwelap.mywebcommunity.org/best_nasb_study_bible_2020.pdfIn PDF document text
    • http://kopogaxepaku.sportsontheweb.net/60142113379.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ee6e56e8-c390-49d2-810b-d4defef8b9c1.filesusr.com/ugd/eda187_dc1b701ef7794fbdbff36feb0146c0a9.pdf?index=trueIn PDF document text
    • http://patuwovoparivi.rf.gd/mefiwelir.pdfIn PDF document text
    • https://f495c71d-628d-4070-9a3d-b699cbb46ba4.filesusr.com/ugd/d99ef3_91303f12d0dc445894d1a46ce1502658.pdf?index=trueIn PDF document text
    • http://jotunoxageleza.rf.gd/18981036623.pdfIn PDF document text
    • https://cb38ef3f-1f2c-4622-8962-dca261660167.filesusr.com/ugd/3ae201_d5df8e4df3014eaaafbc0a7984a988a2.pdf?index=trueIn PDF document text
    • https://83c30a2d-d83c-4020-88f4-fdb7bed8c9e2.filesusr.com/ugd/e59e18_4533c66baf4d4f14ac0d56d85c8dfbcc.pdf?index=trueIn PDF document text
    • https://68fdcf0a-b1f0-4758-9edf-48d2be6d990b.filesusr.com/ugd/ac51ce_3ccfa4ef1a884138821bbfa3d30e9dba.pdf?index=trueIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_0e434364711142c38c89c2871cf812c1.pdf?index=trueIn PDF document text
    • https://356bbf58-84af-4bff-99a9-d03346e46411.filesusr.com/ugd/b5472a_0992ab384a5948c998fea9cabdc4ac49.pdf?index=trueIn PDF document text
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_e205d4f1b4754d77bbacc0fa23e2358e.pdf?index=trueIn PDF document text
    • https://6fc76513-a17a-4053-940d-bef108f5ea85.filesusr.com/ugd/3a5ef0_7c81140ae18240e5a9f5d569bd1f3a82.pdf?index=trueIn PDF document text
    • http://releboxodaw.rf.gd/computer_awareness_mcqs_book_free_download.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_off00010453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10453 5412 bytes
SHA-256: 23511ba75a4103d8860e0fe68f07cbda53e307e6bb651d0943372fcbbf69ed2f
font_01_sfnt_off000116a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A7 10736 bytes
SHA-256: 4193837f2ac6b8243d25071e9fc2058388b3606aabb00e32045c33346a3c2ce0