Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd910fa263a3536…

MALICIOUS

PDF

72.7 KB Created: 2021-04-04 19:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cea768a1c8504a0aef6fe3e48868e583 SHA-1: 72b203c61e4e0df5e50e7ff4f56f344fc9f3ee93 SHA-256: 7fd910fa263a353617b4d92287569b179df1ada4e3eeb8fedd10168b04795146
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to suspicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xezojetit.ru/aws?utm_term=multiplication+worksheets+grade+4+with+answers
    • https://luzoxunijasuw.weebly.com/uploads/1/3/4/3/134338954/goloraxobigagol.pdf
    • http://covidcapsule.world/ping_pong_rules_bounce1stu6.pdf
    • http://renijulemigato.iblogger.org/top_10_android_phones_2018_philippines.pdf
    • https://lugilabujenubo.weebly.com/uploads/1/3/4/3/134320616/7180564.pdf
    • http://tedusoxunola.22web.org/aap_pediatric_blood_pressure_guidelines.pdf
    • http://kleomaften.online/dutogojupiguxunuxodob16wxc.pdf
    • https://static.s123-cdn-static.com/uploads/4486778/normal_5ffa2574d7a9f.pdf
    • https://xofezariro.weebly.com/uploads/1/3/1/8/131871505/587bdf9d77.pdf
    • http://characduwe.space/edexcel_textbook_answers_physicsyjr8n.pdf
    • https://cdn-cms.f-static.net/uploads/4367646/normal_6009ce4082ba5.pdf
    • https://bawokopo.weebly.com/uploads/1/3/1/0/131070727/ronasumiduwepa_velivubanibiz.pdf
    • https://cdn-cms.f-static.net/uploads/4468540/normal_5fd2c2e8c5376.pdf
    • https://static.s123-cdn-static.com/uploads/4466166/normal_600956670e475.pdf
    • https://fezadegijowazon.weebly.com/uploads/1/3/4/0/134096780/d824dc3593d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0ee2617e-ee19-4476-9758-579e4eeb76e8/my_lg_washing_machine_is_leaking_underneath.pdf
    • https://uploads.strikinglycdn.com/files/ccfec3ee-8f0c-4e75-a85e-31b62eba4bfc/96568973548.pdf
    • https://uploads.strikinglycdn.com/files/0631299d-b95d-454d-851c-56c00a3b9931/15206229093.pdf
    • https://uploads.strikinglycdn.com/files/59107bc6-369e-45f0-b9ed-437ffd0d693d/75957214783.pdf
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_20d191bb3fd64e589f7b1fcb21b6114f.pdf?index=true
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_87c2a0552c8b4924b0eef95bc5edd08e.pdf?index=true
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_26f685f9c024466fb6d484088dbd722d.pdf?index=true
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_38d4acb85e55496fa62a54aa6a2630ad.pdf?index=true
    • https://2c8134a4-d865-4da1-8961-c755d7242105.filesusr.com/ugd/6dcf04_de8739668b71429e9d63a3a8f5b58e65.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_off0000deb3.bin
4c1ab5a1cb92bf1b4464a6bc19486440e0634750c45e7a33ee9c9ebd96193536		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB3 5584 bytes
font_01_sfnt_off0000f1d4.bin
6fa6c17e3db1793d0ea516e4fd360249ec79328db8b34fc3e04c8c89a82fafa7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D4 10360 bytes

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