Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d62ba5ab85e9244…

MALICIOUS

PDF

78.8 KB Created: 2021-03-15 06:32:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ffb1a28caf5702b1ceb3df3002a6a155 SHA-1: 2d9e06bc903976766513f6623b637c02b8aa6b71 SHA-256: 5d62ba5ab85e92444453b665e1875c9520e0545567c31fb68246e5d55f79e3d2
156 Risk Score

Malware Insights

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

The PDF contains a link farm and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, contains text related to "Superstar life cheat your way", suggesting a lure to a malicious website. The presence of numerous external links, including one to `dafemum.ru`, indicates an attempt to redirect the user to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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/wix?keyword=superstar+life+cheat+your+way
    • http://gajonedorebuko.mywebcommunity.org/62956900047.pdf
    • https://cdn-cms.f-static.net/uploads/4450514/normal_600c0ddd24c93.pdf
    • https://cdn-cms.f-static.net/uploads/4394062/normal_5fe75702a164b.pdf
    • http://ropufogesuzazeg.iblogger.org/how_long_should_you_give_someone_to_write_a_letter_of_recommendation.pdf
    • http://jolavakizolav.iblogger.org/jejumibepamavafo.pdf
    • https://cdn-cms.f-static.net/uploads/4452593/normal_6035c4c0c87cd.pdf
    • http://suziterunedoloj.sportsontheweb.net/19788974106.pdf
    • https://cdn-cms.f-static.net/uploads/4407782/normal_600fe0e95e5d0.pdf
    • https://static.s123-cdn-static.com/uploads/4368768/normal_5ff763e76066b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nemafu/fire_and_ice_lake_tahoe_ca.pdf
    • http://firuneta.rf.gd/wepevipabu.pdf
    • https://034b020c-baab-45d1-b3ff-c950d21f9178.filesusr.com/ugd/3c93bc_5b172cc6fac246249348f585c6feaf11.pdf?index=true
    • https://s3.amazonaws.com/xonaxevetaf/colorlib_free_portfolio_templates.pdf
    • https://7c8f45b7-e058-4e27-bccd-8ee7dcb26900.filesusr.com/ugd/d5cf39_e97b65507b374bb382ab94cf3677a1f8.pdf?index=true
    • https://s3.amazonaws.com/wiwamoxamo/saxon_algebra_2_answers.pdf
    • https://s3.amazonaws.com/fifomi/93040558953.pdf
    • http://xijewixevav.onlinewebshop.net/72514395364.pdf
    • https://s3.amazonaws.com/nokiva/sublime_text_3_c_code_formatter.pdf
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_85416846eb364737918c7e95943f8d62.pdf?index=true
    • https://s3.amazonaws.com/mujesogi/98068156960.pdf
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_0a736582995140639232058e13655cc1.pdf?index=true
    • https://c31d65df-273c-4bcc-acfb-7b03b0724b99.filesusr.com/ugd/e7e4a0_06e0ee895c0f44dfb3edfac9584dfc18.pdf?index=true
    • http://gogewafusa.rf.gd/risk_assessment_and_prediction_tool.pdf
    • https://s3.amazonaws.com/zukogi/90658197198.pdf
    • https://s3.amazonaws.com/kotenu/76881561568.pdf
    • http://lebekuwawelu.epizy.com/ropesagonewipefapenaraguf.pdf
    • http://situwosase.myartsonline.com/galaxy_s4_mini_daten_bertragen.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_off0000f315.bin
5c96539d5a03c75859c89500e73e09c5984761a4afadf5a9a0404175e8f01fe2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF315 5400 bytes
font_01_sfnt_off00010582.bin
70ecc4d6e6bc4498433b998213eeb6124a3e67983f632280df8eb983ad645068		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10582 11888 bytes

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