Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0c9359e1485aaff…

MALICIOUS

PDF

98.3 KB Created: 2021-04-17 23:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b2b07ac82eb2d2397048f8789afd3f5 SHA-1: 5fe62e18c20356474bbeb833abfe6c2e98b12892 SHA-256: c0c9359e1485aaff978dab972f091ac31d1370b9df31894b6187fe3300ec1a29
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The presence of numerous external links suggests a link farm or phishing campaign. The 'Callback phishing phone lure' heuristic indicates the document likely prompts the user to call a phone number, a common tactic in tech support scams or fraudulent billing schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://kuzutuzo.ru/strik?utm_term=danby+portable+dishwasher+ddw1801mwp+manual
    • https://zelasiboromur.weebly.com/uploads/1/3/1/6/131606405/fonijedikodivusu.pdf
    • https://cdn.sqhk.co/vedoreket/ZEjihdf/buddypress_themes_free.pdf
    • https://cdn.sqhk.co/tojofelekob/TcwgeNn/mobile_legends_bang_bang_pc_version.pdf
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/delexowafimokazob.pdf
    • https://cdn.sqhk.co/xurinuwame/nidRPgd/67143889493.pdf
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/lagebutifotuviv.pdf
    • http://xupokaxe.medianewsonline.com/95382594925.pdf
    • https://kikafizujugu.weebly.com/uploads/1/3/4/0/134012642/92beae7704.pdf
    • https://cdn.sqhk.co/seranowe/jfhXGES/rowewusilan.pdf
    • http://liwonixaxe.iblogger.org/11229488948.pdf
    • https://cdn.sqhk.co/baluwofuk/6GkFre3/74492391882.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://risawanidav.epizy.com/kuvab.pdf
    • https://s3.amazonaws.com/vuxagixil/kairosoft_game_dev_story_apk.pdf
    • https://uploads.strikinglycdn.com/files/10ae65cb-d2a9-4127-a12b-39dfc01265dc/xokeratefiluximetojowo.pdf
    • https://uploads.strikinglycdn.com/files/3410b4ed-890a-47f7-b32a-0ef60e211c3b/futevawadugu.pdf
    • https://s3.amazonaws.com/xakusineba/fatidigotofijidofos.pdf
    • http://biburusig.myartsonline.com/embankment_construction.pdf
    • https://uploads.strikinglycdn.com/files/da0b6561-42e8-480f-a6d3-d11f7d52b578/15280451611.pdf
    • http://lotijedopedo.epizy.com/46729292574.pdf
    • 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_off00013cea.bin
98774d18116acae19c08474572ab3efdf0a0361133827f7a8ff0b404b7fe0a68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CEA 5920 bytes
font_01_sfnt_off000150fe.bin
df3efb1f2d2e5a12fb68abd00be416dd0d6da7b38019f9ee9338f9a4c4d91c11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x150FE 12192 bytes

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