Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e9719fc6a4ea003…

MALICIOUS

PDF

82.1 KB Created: 2021-04-11 00:42:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09df35a06a1feeb4a6e032a7a58d1b53 SHA-1: 4ba2ee3018c3ddf4958b724b9763bc6540e05544 SHA-256: 8e9719fc6a4ea003173c27d706e46ccb1f734d494f45195813418a4be231036d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. The primary URL, https://midufefew.ru/strik, is likely used to redirect the user to a malicious site, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/strik?utm_term=how+do+i+find+my+saved+items+in+marketplace
    • http://detixaluziweki.22web.org/33190868586.pdf
    • https://cdn-cms.f-static.net/uploads/4367300/normal_6068dbc962ccb.pdf
    • https://cdn-cms.f-static.net/uploads/4405179/normal_603c744c0c126.pdf
    • https://cdn-cms.f-static.net/uploads/4366630/normal_60341d10668da.pdf
    • https://cdn-cms.f-static.net/uploads/4369165/normal_603d03924e605.pdf
    • https://static.s123-cdn-static.com/uploads/4412159/normal_5ff16fe010e69.pdf
    • https://cdn-cms.f-static.net/uploads/4462714/normal_606e095f2ac9a.pdf
    • https://cdn-cms.f-static.net/uploads/4465565/normal_602296802e1ac.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://potusulutul.rf.gd/railway_psychological_test_books_free_download_in_english.pdf
    • http://buxebawimiro.epizy.com/castiel_angel_form.pdf
    • https://s3.amazonaws.com/nitidadufetenu/78629859798.pdf
    • https://s3.amazonaws.com/xujitezu/91688301532.pdf
    • http://savekuf.rf.gd/76470128532.pdf
    • http://jixosakotipol.epizy.com/authentic_leadership_journal.pdf
    • http://parapaxesu.rf.gd/lanolopajevukeza.pdf
    • https://s3.amazonaws.com/nemafu/ashton_hagans_nba.pdf
    • https://49b7c339-fea6-4bb3-bf7b-ca47af5263df.filesusr.com/ugd/6ca12d_5ba1bfa0de384870ae085f803667995a.pdf?index=true
    • https://s3.amazonaws.com/sugowubuf/16279248628.pdf
    • https://43466d02-873c-4564-b63c-f2f79aa6d38e.filesusr.com/ugd/fd64e8_3bd3ccccf875400898e74c1c0b72168f.pdf?index=true
    • http://demajipo.rf.gd/zaroneditatabafuru.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_off0000f849.bin
9bcf236ae67bd55e720cb27abd2337d3b7497a4b2b7fc2ca25e2421dac2270ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF849 5580 bytes
font_01_sfnt_off00010b45.bin
b360d73ad526846d66f4cf12690e199ff8f001348b5a60117a3b0c293c15f912		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B45 1920 bytes
font_02_sfnt_off0001146c.bin
2173fddee0fbfb176ae06136c48ae3914b0becda33e0195ddfa68a4deb9a0643		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1146C 11084 bytes

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