Malicious PDF — malware analysis report

Static analysis result for SHA-256 31603770d9bc169c…

MALICIOUS

PDF

77.9 KB Created: 2021-04-06 02:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: af32f18ee154564c961dd00d4ff12e85 SHA-1: 4fd6434034bef07ae09bfe49d8bcad43a3cdcfe3 SHA-256: 31603770d9bc169c465ac0e8f6e20f994c0262837a5306e3c6f042a9e28d967c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a prominent one leading to 'resalured.ru', disguised as a search result for game-related content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, further supporting a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://resalured.ru/strik?utm_term=super+mario+3d+land+3-4+star+coins PDF link annotation
    • http://gagogepatajebe.medianewsonline.com/xamujebetewuridubemufiza.pdfIn PDF document text
    • https://cdn.sqhk.co/zujumatatub/fibBR8V/45382019555.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485440/normal_5feb843350cc7.pdfIn PDF document text
    • https://mufogijagojar.weebly.com/uploads/1/3/1/0/131070489/446e96c330.pdfIn PDF document text
    • https://cdn.sqhk.co/gabixeme/bDhdKge/grand_theft_auto_premium_online_edition_xbox_one.pdfIn PDF document text
    • http://moxipafuxoxo.mygamesonline.org/wejetuvinuzuvasesu.pdfIn PDF document text
    • http://xadazobisisim.scienceontheweb.net/61623951851.pdfIn PDF document text
    • https://kanapajuzusuma.weebly.com/uploads/1/3/4/5/134589940/mopakuta-xibogepuvazuwir-wirijugoro.pdfIn PDF document text
    • https://xoxudepibedewem.weebly.com/uploads/1/3/5/3/135317482/gejeroxolat.pdfIn PDF document text
    • http://vatidenow.medianewsonline.com/amazon_kindle_d00901_reset_button.pdfIn PDF document text
    • https://kozegefiseram.weebly.com/uploads/1/3/1/3/131379202/ponivit-wiwaz-tovojatudebu-vuvutemowamow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420924/normal_604657549d183.pdfIn PDF document text
    • https://vosuzujil.weebly.com/uploads/1/3/2/6/132681517/bipenafajop.pdfIn PDF document text
    • https://fitisasituwag.weebly.com/uploads/1/3/4/8/134846324/9685780.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvavegipap/cgjgjih/huawei_watch_gt2_apple_health.pdfIn PDF document text
    • https://gonadasefu.weebly.com/uploads/1/3/5/3/135345348/23f9eba2fb.pdfIn PDF document text
    • https://cdn.sqhk.co/rixutixim/gdXGuNd/cossacks_3_scotland_units.pdfIn PDF document text
    • https://cdn.sqhk.co/setanutoba/cXhd5ja/bariatric_surgery_guidelines_2018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418556/normal_5fd1c3b4517d7.pdfIn PDF document text
    • https://mudasolujo.weebly.com/uploads/1/3/4/8/134886274/sipewetinefuvo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dazawojob/how_to_lower_craftsman_bottle_jack.pdfIn PDF document text
    • http://lixugafepujijoj.onlinewebshop.net/724952827.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/42136376720.pdfIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BF 5604 bytes
SHA-256: 13f021391829ee0ab4d974025e42a3a92002e7aa89b2dc57baed8ee25909a8ad
font_01_sfnt_off000106bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BF 10272 bytes
SHA-256: 5ab464242116cee870d541a8fb22da6ef5e226ac4099092bbc7c0fb072555053

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