Malicious PDF — malware analysis report

Static analysis result for SHA-256 8281ffa4d2a863cc…

MALICIOUS

PDF

93.5 KB Created: 2021-03-17 23:22:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 999eea590f0e4d40dc240c6dbb4ef67a SHA-1: 1d2672ffe91b0afcd8b05f3988c31eab694f0a38 SHA-256: 8281ffa4d2a863cc75093bd0f526dc5974c2f34f628ee4a29ab023e93e560a9f
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 are to obscure domains or file-sharing services, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for distributing further malware or conducting phishing. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=gaggia+brera+2011+manual
    • https://lewotivegil.weebly.com/uploads/1/3/4/3/134320996/telegasunoxupeb-nonufubun-lupedujegejax-todukaz.pdf
    • https://jaduxokapatusiw.weebly.com/uploads/1/3/5/3/135301375/supixafakena-fazurabazelo.pdf
    • https://jokiputukalak.weebly.com/uploads/1/3/1/1/131164130/794fda4.pdf
    • http://abanca-electronica.com/why_isnt_procreate_on_my_app_storeazjog.pdf
    • http://blu-ital.space/decoding_the_toefl_ibt_actual_test_rqgrpn.pdf
    • https://sudarotabodubig.weebly.com/uploads/1/3/1/4/131407445/7407171.pdf
    • https://nusuxoxoli.weebly.com/uploads/1/3/2/7/132710665/folilo.pdf
    • http://yoptan.space/97299304590yf9ms.pdf
    • https://bogigusojuvifu.weebly.com/uploads/1/3/4/3/134316749/8785685.pdf
    • https://siwizapetodid.weebly.com/uploads/1/3/4/0/134041585/buvuxodopuraparepif.pdf
    • http://nuverlites.online/ralebudezutebaxukuk8v31o.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://435a888a-8f80-410d-aa77-77edd6e4491d.filesusr.com/ugd/51fec0_129bdddb504f457a97a09aa454607cac.pdf?index=true
    • https://42cc6f6d-9125-48bc-bce4-1bf15f49b1be.filesusr.com/ugd/7c30af_a964b86290454921a0279a56f056f29b.pdf?index=true
    • http://sopazizepo.rf.gd/rarigapimilamakudemefeji.pdf
    • https://s3.amazonaws.com/vipuxafol/21220451239.pdf
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_70d225866fc2409b85c11ba0d626f97e.pdf?index=true
    • https://f815f12b-539f-4060-8ed9-abd2caada31b.filesusr.com/ugd/ceb2e8_d5b6276af6b943ccb2c73b7953bf58c2.pdf?index=true
    • http://fasufigosekuwuw.rf.gd/how_do_you_turn_on_the_heater_on_a_mitsubishi_air_conditioner.pdf
    • http://fojodopid.rf.gd/38797689272.pdf
    • https://s3.amazonaws.com/votubukaxogilix/63943421259.pdf
    • https://s3.amazonaws.com/tutasujal/what_medical_coding_specialty_makes_the_most_money.pdf
    • https://s3.amazonaws.com/mokixetat/ihss_san_francisco_timesheet.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_off00013194.bin
8e5a6f5158e9b7eb4f6b2e63123dddd5ff4f3524e8f9694dca271a6157a4ba23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13194 5324 bytes
font_01_sfnt_off000143a2.bin
b1bdabf67293c05c31852d91d3a8d61481c2dd158250beaca32729c27f69b593		 pdf-font-stream PDF embedded font (sfnt) at offset 0x143A2 11616 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.