Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfbf7d5075652e8d…

MALICIOUS

PDF

75.5 KB Created: 2021-05-18 16:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 35b9ab0951dfc41bdf258cb2fe9b4d14 SHA-1: 63db9bf639341220805d5636ce23f0e33a911776 SHA-256: cfbf7d5075652e8da26fe23301a49bc5f6c26b9f372625e42bb25476521b5435
194 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The primary link, 'https://fokemale.ru/strik?utm_term=how+to+reset+tp+link+tl-wr841n', suggests a lure related to network device configuration, likely leading to a phishing or malware distribution site. The presence of a "download button" heuristic further supports a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fokemale.ru/strik?utm_term=how+to+reset+tp+link+tl-wr841n PDF link annotation
    • https://setinedib.weebly.com/uploads/1/3/4/6/134684411/5582296.pdfIn PDF document text
    • https://wivixape.weebly.com/uploads/1/3/4/8/134897282/xulenifulujiwubenege.pdfIn PDF document text
    • https://dipapira.weebly.com/uploads/1/3/4/6/134610741/ccd301.pdfIn PDF document text
    • https://rerajegido.weebly.com/uploads/1/3/1/4/131407096/059e02780b.pdfIn PDF document text
    • https://ronifevux.weebly.com/uploads/1/3/4/7/134737402/dubukonepuwobim_rezixo_geruvef_misegol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cfca495-960a-43c3-97fb-4ebdde85f9a9/mokedewowijazanuduvajakub.pdfIn PDF document text
    • http://juzudine.rf.gd/vazelomorupaduloduvewis.pdfIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/86675433751.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/73103299227.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66839245-56fd-49f9-bc2b-33dce0d45e4b/thanksgiving_reading_comprehension_worksheets_high_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6c428d7-1410-4256-afab-7e71b9daf860/what_is_the_best_irrigation_system_controller.pdfIn PDF document text
    • http://wamodaf.epizy.com/arnett_new_punjabi_song.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/vevukogulewapuvupega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8249d82b-9143-4ef7-acf2-99db1fcddbda/is_verizon_iphone_compatible_with_straight_talk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/974cc2dd-7329-4c98-80e7-dfeeca31ac24/91922699959.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/varukuzavegir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf6853ea-d8a7-4810-8a42-d1caaee9f00d/62902929428.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/gasepowozeg.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/32446150900.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_off0000ea4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4F 5088 bytes
SHA-256: 51fe10265c9e61406f8657afc0fc408b23c4854341e6748612696e76ce00c62c
font_01_sfnt_off0000fbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD3 10856 bytes
SHA-256: f72fdd2e20fa6fa495da82902487ae82fb5a03d59d8e1f201308d245b1b5eb82