Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a3a7684cd34b49e…

MALICIOUS

PDF

116.5 KB Created: 2021-03-25 04:02:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0d1269097cb432b81f57c8f943ea37c SHA-1: 2a3d88fb7026f3dd3b875236cada4ec9de2ed3d8 SHA-256: 8a3a7684cd34b49e393a7c2da16f7a86433e25d60453d391b7d3c55222054f18
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in SEO link farms to manipulate search engine rankings or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/wix?keyword=2pac+all+eyez+on+me+full+album+playlist
    • https://cdn.sqhk.co/rabataxuvax/dggdMjj/gold_farmer_games.pdf
    • https://static.s123-cdn-static.com/uploads/4472501/normal_5ffbae9e6d409.pdf
    • https://cdn-cms.f-static.net/uploads/4496584/normal_60570910d82fa.pdf
    • https://fozuxuvaporoj.weebly.com/uploads/1/3/1/8/131856883/gulafoxipasolagubid.pdf
    • https://cdn.sqhk.co/jimatoju/hagiPls/14747224007.pdf
    • https://cdn-cms.f-static.net/uploads/4451755/normal_604746aadd150.pdf
    • https://cdn.sqhk.co/bisuligiga/Kyhi8vQ/50_in_1080p_tv.pdf
    • http://perevod24-card2card.site/novumipooxvyl.pdf
    • https://cdn.sqhk.co/votojuxosaf/IriiVhe/easycoloring_anime_and_manga_coloring_page.pdf
    • http://igcopyrightforhelps.com/making_daphnia_cultureuww7p.pdf
    • https://cdn-cms.f-static.net/uploads/4496153/normal_60183f8d7ae6b.pdf
    • https://cdn.sqhk.co/xonarewu/nV5IySk/45020701507.pdf
    • https://cdn-cms.f-static.net/uploads/4380411/normal_5fd681a88811a.pdf
    • https://vabijerokajesi.weebly.com/uploads/1/3/4/5/134595953/1296496.pdf
    • https://guwokizesagemi.weebly.com/uploads/1/3/4/8/134855090/4947378.pdf
    • http://zzzmmmmejjj.space/suppandi_tinkleuiuhq.pdf
    • http://ch-bewertung-2888.xyz/nightcore_switching_vocals_mashup50xcs.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9bb688b8-41e9-453a-aa33-65d5b3d63cc5/what_type_of_energy_does_a_windmill_used_to_work.pdf
    • https://uploads.strikinglycdn.com/files/dd55a4d5-3073-44a7-b6da-fcab04179f0f/60934141724.pdf
    • https://90e68d66-75cd-4f9f-aa76-03b1e6b67b4d.filesusr.com/ugd/324cd8_64a176ee8f634b1787747087f0c406b9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d470c30d-6aac-4ee2-bb53-26a981000eaa/63531018774.pdf
    • https://9d349da1-218b-4b59-9e37-2a90cab56d40.filesusr.com/ugd/de9003_b54c8ce1631449b7a1cfe8d795ac6883.pdf?index=true
    • 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_off0001871b.bin
374c166a9657a864518a9a4c18fb0a35bb6f5e15cdf73b918a0a67084a34d549		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1871B 5396 bytes
font_01_sfnt_off00019972.bin
272f7b68c6a34fba5da7332c16f21d4b5cad4f2feecb62e25b253d201fd407c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19972 12140 bytes

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