Malicious PDF — malware analysis report

Static analysis result for SHA-256 6858b1d398f9fb83…

MALICIOUS

PDF

77.7 KB Created: 2021-05-10 21:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: bf6d79a9c2233f61796a2af4f2d51b16 SHA-1: 2b598bf44bdaa7308dcde7f8a7716cf9b255e044 SHA-256: 6858b1d398f9fb83d1a127e3dc70a416091ede7456f150acce86b2a4a613a9c0
126 Risk Score

Malware Insights

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

The PDF document contains a lure related to resetting voicemail passwords on Android phones, directing users to a suspicious URL. Heuristic analysis indicates this is a phishing attempt, and the ML classifier strongly flags it as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lead the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://baarspo.ru/strik?utm_term=how+to+reset+voicemail+password+on+android+phone PDF link annotation
    • https://cdn.sqhk.co/tezofugowura/eThcjfc/nefezukiforure.pdfIn PDF document text
    • http://wiinorama.website/54503385494lljdn.pdfIn PDF document text
    • https://cdn.sqhk.co/lisesemafo/ieEggji/jimmy_john_s_sandwiches_coupon_code.pdfIn PDF document text
    • http://calipshatngaccs1.xyz/information_retrieval_vs_information_extractiony7v0m.pdfIn PDF document text
    • https://cdn.sqhk.co/bujasugawo/0whe66M/2501698181.pdfIn PDF document text
    • https://cdn.sqhk.co/xebibugekux/hjhghgj/gesexagur.pdfIn PDF document text
    • http://useporte.xyz/akcent_i_m_sorry_mp4_song85cmm.pdfIn PDF document text
    • https://cdn.sqhk.co/bomoxale/aUTv9Co/69147094630.pdfIn PDF document text
    • http://numberoone.xyz/2954675561rbvt8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458829/normal_600e2a92ae06b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499341/normal_6068af0c985bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473056/normal_60179bc6ecc1b.pdfIn PDF document text
    • http://italy-small.space/nuwemewusu2lhw3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/31458955780.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/24503022499.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/62977776937.pdfIn PDF document text
    • http://revodez.myartsonline.com/64718426253.pdfIn PDF document text
    • http://sawurawefivovo.myartsonline.com/download_aksara_sunda.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/google_assistant_dark_mode_android_10.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_off0000eeb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB8 5424 bytes
SHA-256: 6719400732025097be474f703e6187e847df8267f9d90aaa6c12ac682ac26003
font_01_sfnt_off0001010e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010E 11372 bytes
SHA-256: 919d8f51113a0be10f556430c90f7f4ce30ef3c9113c607e37ccc4116853eafe

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