Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d456e653f452b4…

MALICIOUS

PDF

64.2 KB Created: 2021-01-29 18:08:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8216d3877adce9a2a49918b90b673449 SHA-1: 3df65445247f9d04531645f3194acf1e8cff504f SHA-256: a2d456e653f452b49644c77a760a9c728388c50b235aab7c2a626b6f04b5d040
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it functions as a link farm, potentially for SEO manipulation or to distribute further malware. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of PDF exploits often involves embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://bologen.ru/wb?keyword=pet%20doctors%20of%20america%20jacksonville PDF link annotation
    • https://cdn.sqhk.co/bowawugafux/hjUyZgc/move_whatsapp_from_ios_to_android_free.pdfIn PDF document text
    • https://kiwitelovig.weebly.com/uploads/1/3/4/3/134358902/5352900.pdfIn PDF document text
    • https://cdn.sqhk.co/roretuduva/uhbjcwT/royal_battletown_hack_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/ibhhcha/panekujelivusux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387826/normal_6005f32296120.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501380/normal_5fe309b35bf5f.pdfIn PDF document text
    • https://sadaxolofomet.weebly.com/uploads/1/3/1/4/131453623/8d6dec0f1933.pdfIn PDF document text
    • https://cdn.sqhk.co/tinupolureg/iPkictu/nijikunine.pdfIn PDF document text
    • https://cdn.sqhk.co/pitekofotada/4rrVHW3/run_race_3d_free_online_play.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485946/normal_5ffd1cbc77979.pdfIn PDF document text
    • https://cdn.sqhk.co/nomazotesi/Kwjic7s/ritapo.pdfIn PDF document text
    • http://sajutasure.22web.org/remujakok.pdfIn PDF document text
    • http://fuzirirofo.iblogger.org/fatejokuvisebemixidonuko.pdfIn PDF document text
    • https://cdn.sqhk.co/lelogivotosu/eXpugc1/27833595485.pdfIn PDF document text
    • https://sovopedu.weebly.com/uploads/1/3/5/3/135301682/f9ed9af7f708ca.pdfIn PDF document text
    • https://sarununow.weebly.com/uploads/1/3/4/3/134366188/3101470.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369631/normal_5fe0ef20af2c7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kinapemib.rf.gd/c._elegans_tarantula_care_sheet.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_off0000bfed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFED 5368 bytes
SHA-256: 8bdf4b91555d931ce0aade3d730859a1697d4f819b78c13664bcd12b56e375b8
font_01_sfnt_off0000d225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD225 9856 bytes
SHA-256: f38863b6071c024240abae5c3fab8a6585ac633be88cd5569c3a9877478aac22

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