Malicious PDF — malware analysis report

Static analysis result for SHA-256 89f07ec98cbb54eb…

MALICIOUS

PDF

81.0 KB Created: 2021-04-01 16:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3961d8d0cd7402a5a3f7a0bc8affaba0 SHA-1: 5729e0984b94f1ac62796bbf5f0ee58eaf6e631f SHA-256: 89f07ec98cbb54eba4b8e41684e1ba18fe14f77bf0ff60539355e47718b2f2a4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. The embedded URLs, such as 'https://dafemum.ru/award?keyword=online+pdf+bookmark+remover', suggest a phishing or SEO manipulation tactic. While no scripts were directly extracted, the presence of external links and the ML classifier's high confidence score indicate malicious intent, likely to redirect users to malicious sites.

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://dafemum.ru/award?keyword=online+pdf+bookmark+remover
    • https://rexaririwe.weebly.com/uploads/1/3/1/6/131637114/8831969.pdf
    • http://ighelpcenter.xyz/kaspersky_battery_life_apk_uptodownltvo5.pdf
    • https://jitotapo.weebly.com/uploads/1/3/5/3/135314003/minizakudiwu-nozedaj-fadotosa-fijipoxopivej.pdf
    • http://liketime.fun/oil_heaters_making_noisesa2vjz.pdf
    • https://litepuvib.weebly.com/uploads/1/3/4/7/134741427/rebulufelize.pdf
    • http://pmaider.com/22973014358w2ydm.pdf
    • https://kobenavu.weebly.com/uploads/1/3/4/7/134714827/wekuredep.pdf
    • http://dimozakebaba.scienceontheweb.net/sinujuretuzugujonumonozaj.pdf
    • http://daliadiago.com/gebifumifoawyv9.pdf
    • http://apple-fruit.space/defensive_driving_course_nj_answersq5smy.pdf
    • https://xufidevudog.weebly.com/uploads/1/3/4/3/134389214/b4260dd5c66608.pdf
    • https://cdn-cms.f-static.net/uploads/4473638/normal_603890f2915f9.pdf
    • https://cdn-cms.f-static.net/uploads/4449789/normal_605c84f2c55f9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gotenukevepunin/9712517250.pdf
    • https://s3.amazonaws.com/retisovojor/picsart_mod_ios.pdf
    • http://famomijis.onlinewebshop.net/11789874775.pdf
    • https://s3.amazonaws.com/lejivugeleguwod/87661431006.pdf
    • https://s3.amazonaws.com/wegemebufojafak/watulodezegasubav.pdf
    • https://s3.amazonaws.com/peveziwoguxuzam/sujijosepeveza.pdf
    • https://s3.amazonaws.com/dosipive/makusidajibikowam.pdf
    • https://s3.amazonaws.com/tikoweravisixu/kelutosutinutelojimo.pdf
    • https://s3.amazonaws.com/kexamoxusinixu/it_essentials_chapter_2_exam_answers_2017.pdf
    • https://s3.amazonaws.com/xidulumexi/boogerman_game_for_android.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_off0000fdef.bin
ee792a01a0a475d9327c71d42e6a6c33a691aaa8ea63e123a0bfe7df1b755f66		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEF 5300 bytes
font_01_sfnt_off00010fe1.bin
da4ca6b78f27512547fc0259079a2ba23ab82949aef3c6bdd4244073fad9c013		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE1 11556 bytes

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