Malicious PDF — malware analysis report

Static analysis result for SHA-256 1efc34f48aeb74b0…

MALICIOUS

PDF

156.8 KB Created: 2021-03-26 08:03:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 725d5faeaee0d88bb15a2c3ef8b9bc18 SHA-1: b2777d894132b9cb82656cb05a63b6d138bd970b SHA-256: 1efc34f48aeb74b094ff87287a46c033eaf494a6779b9b186ec9dbbb273bf137
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, appears to be a lure related to educational search terms, directing users to a link farm designed to host malicious content. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/wix?keyword=algebra+1+unit+2+linear+functions+l9+answers PDF link annotation
    • https://cdn.sqhk.co/kixikeli/PYMOwjj/84496766552.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/ibEFifk/ares_virus_mod_apk_unlimited_coins.pdfIn PDF document text
    • https://garowenin.weebly.com/uploads/1/3/4/6/134662298/togikeweru.pdfIn PDF document text
    • https://cdn.sqhk.co/kulamogo/jDidUcG/76624769820.pdfIn PDF document text
    • https://sowematawenuw.weebly.com/uploads/1/3/1/1/131164153/kubumewozujuvezabak.pdfIn PDF document text
    • https://cdn.sqhk.co/sapidefapo/yhhiabC/kuvutesotozataxazoxivov.pdfIn PDF document text
    • https://wivixape.weebly.com/uploads/1/3/4/8/134897282/dibepebipaxi.pdfIn PDF document text
    • https://cdn.sqhk.co/sawijewabob/6vYkicK/vusojuzodaniseb.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/hiahfYh/24128399886.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392871/normal_603c6325e0382.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/hbijYJm/bowling_shot_clock_violation.pdfIn PDF document text
    • https://cdn.sqhk.co/tamaladafa/Dgjcyjc/air_manager_tycoon_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490739/normal_5fc7e4aa8e4b9.pdfIn PDF document text
    • https://cdn.sqhk.co/sesexibanobu/Hgdzdib/ninja_vs_zombies_2_apk_oyun_indir_club.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/9OSGcja/takavinusoredela.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a2214900-82f6-4ed5-a432-d5ffd14110fa.filesusr.com/ugd/306b6b_2d74b16f0814459993629b31bacedb73.pdf?index=trueIn PDF document text
    • https://f3b86e06-b3aa-4ee1-82f7-79049f3379a8.filesusr.com/ugd/0c4fd2_7dfb6de9a2d24df89bf4d467896a4542.pdf?index=trueIn PDF document text
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_bbf1cf9c7dab46f2b37b1fcdeb5a47a3.pdf?index=trueIn PDF document text
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_a67129edfbbb4069b8dbd0f5116fc7df.pdf?index=trueIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_9a2d2ac8875f4e7bbbdd320c93f03072.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F021 2952 bytes
SHA-256: cb9072f881c1fe0ad8900bbcc5a20a23fabb306412f64e001cac76c2a9509f2c
font_01_sfnt_off0001fab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FAB0 5612 bytes
SHA-256: 88f26d55799aee2e9732883f2898896806b5123ef9e435ca399e5a7edce896db
font_02_sfnt_off00020dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20DEC 2472 bytes
SHA-256: d198819af64b762a551218fb37e97137b1579b3c63d3ee16b046cc131de99e16
font_03_sfnt_off0002182b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2182B 15836 bytes
SHA-256: b53cb9adcfd5c484ff3637216bda7690be32b6f65faed67cf3c61435228de164
font_04_sfnt_off00024d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24D29 16140 bytes
SHA-256: f4327240e9c548fd121cf29253eb026d9bbc49c528fa2d137c3ad138422a6458