Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b37a442b9b4a4b0…

MALICIOUS

PDF

77.0 KB Created: 2021-03-18 06:18:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05c1feecacd5628f7acbc81a7331e07d SHA-1: 93d5a5e85c86b16ccba89f76a6f39ec8bde08bbf SHA-256: 5b37a442b9b4a4b0e2ff0858e3c968812982f698cb0e462e504438d285d0c640
186 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous external URLs, many of which are hosted on disposable domains, and a specific heuristic indicates it's a 'Recovery secret / private key request' lure. While no scripts were explicitly extracted, the presence of external links and the nature of the lure suggest a phishing attempt to harvest credentials or sensitive recovery information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/123?utm_term=video+from+link+to+mp4
    • https://josudumebumokix.weebly.com/uploads/1/3/4/0/134040650/vusaputunasurosemu.pdf
    • http://janusadow.mygamesonline.org/78653243794.pdf
    • http://goginexoze.22web.org/10350927361.pdf
    • http://godulonu.22web.org/boxuvaxa.pdf
    • https://cdn-cms.f-static.net/uploads/4488316/normal_601e352b41fa1.pdf
    • https://zuwogirunuwexi.weebly.com/uploads/1/3/5/3/135331524/4599907.pdf
    • https://cdn-cms.f-static.net/uploads/4475866/normal_6037fcf079c61.pdf
    • https://mefupajudeto.weebly.com/uploads/1/3/4/8/134883840/7679189.pdf
    • http://nadefememidep.medianewsonline.com/pdf_to_word_online_farsi.pdf
    • http://kejurudoji.medianewsonline.com/69602501765.pdf
    • https://static.s123-cdn-static.com/uploads/4469355/normal_5fcc60acc5fd4.pdf
    • https://cdn-cms.f-static.net/uploads/4384050/normal_6039bb02a3d21.pdf
    • https://cdn-cms.f-static.net/uploads/4469116/normal_604b8ec239027.pdf
    • https://jazazigiw.weebly.com/uploads/1/3/1/3/131398077/5f5f2c96.pdf
    • https://rixokofumi.weebly.com/uploads/1/3/1/3/131380985/63ec2526.pdf
    • https://cdn-cms.f-static.net/uploads/4393514/normal_6049fa23dad12.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pewokes.epizy.com/mcdonald_s_australia_nutrition_information.pdf
    • http://tafisikakilusip.epizy.com/facebook_account_recovery_code_not_working.pdf
    • http://nimizojajokupij.rf.gd/nubumivinefi.pdf
    • http://wewenak.rf.gd/hardness_of_water_experiment_lab_report.pdf
    • http://fojofediwesifog.rf.gd/64611022550.pdf
    • http://lumosaneja.onlinewebshop.net/blender_2._80.pdf
    • http://zibelasavu.atwebpages.com/37948698774.pdf
    • http://tipaduvorul.epizy.com/the_last_wish_full_movie_free_download.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_off0000f10f.bin
21e605a24324101abe3f1dc50c02374cda9d5a409f78b7be96c8e859709cfa98		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF10F 4916 bytes
font_01_sfnt_off000101bc.bin
d15c3b707bdd0e65b23efac36cb9fed08aa10ea15ff79903154fe1e136ddd62e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101BC 10816 bytes

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