Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffa9cb86047da0ab…

MALICIOUS

PDF

66.9 KB Created: 2021-02-08 12:39:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e7b3362e0fac84555d63c8df790c4c67 SHA-1: 1626e874849257d15b1cf8b205083feb42a3b6bb SHA-256: ffa9cb86047da0abd35573615b1be83be8c5ba8822023da16971efaeb3e4a6da
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a likely attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for distributing phishing content or malware.

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://seumenha.ru/wb?keyword=html%20form%20button%20type%20submit PDF link annotation
    • https://cdn.sqhk.co/nebuneduzib/ehhhehd/zuvenitufetevujinunen.pdfIn PDF document text
    • https://cdn.sqhk.co/ribobujir/heigKTa/about_mastermind_defense_academy.pdfIn PDF document text
    • https://cdn.sqhk.co/rubupidorinu/eQzOhg2/71684749101.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502246/normal_5fc5a0509606f.pdfIn PDF document text
    • https://cdn.sqhk.co/vunelebu/ijQiiXx/amf_bowling_near_me_prices.pdfIn PDF document text
    • http://mattelipsticks.site/oliver_twist_oxford_bookwormsu2ydk.pdfIn PDF document text
    • https://cdn.sqhk.co/tonukabonuwe/b1Zjetw/picture_text_editor_online_free.pdfIn PDF document text
    • http://tertov.xyz/aloo_matar_ki_sabji68idr.pdfIn PDF document text
    • https://cdn.sqhk.co/pugirunosamo/giifjcv/dead_man_walking_brent_faiyaz_lyrics.pdfIn PDF document text
    • http://creditscorehelp.info/25536803647mw7ho.pdfIn PDF document text
    • https://cdn.sqhk.co/manuguwe/Sniqshg/superhero_robot_prison_escape_room_survival_mission_1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tenazapuxukov.epizy.com/lugubojujowutemon.pdfIn PDF document text
    • https://s3.amazonaws.com/mujesogi/new_army_uniform_ww2.pdfIn PDF document text
    • http://rawopewudoj.rf.gd/european_guidelines_pulmonary_arterial_hypertension.pdfIn PDF document text
    • http://jomerijokera.rf.gd/cm_awas_yojana_up_online_form.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/97772717975.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_off0000c86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86A 5040 bytes
SHA-256: b383a15d6639836f430b8ab8a1d6f17ea9ec59e8facec846803a3f82e14325c0
font_01_sfnt_off0000d980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD980 11024 bytes
SHA-256: 17a31d8b60eeb60f111a329f0de03511b4c25930eceea970cdaadac9d11efa0a

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