Malicious PDF — malware analysis report

Static analysis result for SHA-256 95234963796105c9…

MALICIOUS

PDF

70.9 KB Created: 2021-01-18 08:52:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 384201a4fae58b7df64d85b1079609e1 SHA-1: 3aa7bfdcecb149c1d05a5608300f593376ac0693 SHA-256: 95234963796105c903eb8fc6fac57600f74d8ab0178665c4c19d88c40f54d509
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link farm and a high ML classifier score, indicating malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this. The document body, though heavily obfuscated, suggests a lure related to 'Mkt 571 final exam answers', likely to trick users into clicking the embedded malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://trafftec.ru/123?utm_term=mkt+571+final+exam+answers PDF link annotation
    • https://site-1245107.mozfiles.com/files/1245107/tovinizodebebole.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476577/normal_60011b1792213.pdfIn PDF document text
    • https://site-1166068.mozfiles.com/files/1166068/92265281540.pdfIn PDF document text
    • https://site-1166739.mozfiles.com/files/1166739/xubad.pdfIn PDF document text
    • https://site-1247386.mozfiles.com/files/1247386/bushnell_565_telescope_instruction_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427097/normal_5fd18981d0985.pdfIn PDF document text
    • https://site-1185524.mozfiles.com/files/1185524/71698099340.pdfIn PDF document text
    • https://site-1168265.mozfiles.com/files/1168265/nerofaxomebuga.pdfIn PDF document text
    • https://site-1241413.mozfiles.com/files/1241413/zuminiwilafilufowotomi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465387/normal_5fe3ff98d4b04.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gomitobovuni.rf.gd/bolero_classical_guitar_sheet_music.pdfIn PDF document text
    • http://vobisobopimab.epizy.com/41755523180.pdfIn PDF document text
    • http://xelidamos.epizy.com/yahoo_boy_application.pdfIn PDF document text
    • http://bavigozobuk.rf.gd/59463488659.pdfIn PDF document text
    • http://sawopigemon.epizy.com/97681769813.pdfIn PDF document text
    • http://pixuxurarosu.epizy.com/retefojesosasimefor.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_off0000d7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F9 5400 bytes
SHA-256: 81ce8119f2814a67a6c8591aea26133ec2e3c5c2f919bac58bfeeec0d85bfe6a
font_01_sfnt_off0000ea7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7A 10736 bytes
SHA-256: 8416fc9fbfcb59fe636bf40fb4ff5cd8ee8ac5f2909a3ba3c7d28a1660e87b7d

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