Malicious PDF — malware analysis report

Static analysis result for SHA-256 a66d0dd62594dbec…

MALICIOUS

PDF

98.0 KB Created: 2021-04-04 13:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab77b1d728d5d2258cc7cdc7f46138b0 SHA-1: 975fb8b869533211dcb3e17bedd98f6239752def SHA-256: a66d0dd62594dbec23c1e4e38ba2da118547b6cd029a2d8f806a064c01ee51d7
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a phishing or malware distribution attempt. ClamAV detection and ML classification strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious document designed to redirect users to potentially harmful content.

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://resalured.ru/strik?utm_term=how+high+are+400m+hurdles
    • http://bovibuvebus.getenjoyment.net/brinkmann_gourmet_charcoal_smoker_modifications.pdf
    • http://fawikenaxalu.scienceontheweb.net/nofuwuzamuxu.pdf
    • http://gojawufeki.getenjoyment.net/hegemony_and_socialist_strategy.pdf
    • https://nuribivavis.weebly.com/uploads/1/3/4/6/134625990/1d2c893474bd4b8.pdf
    • https://nutewoxob.weebly.com/uploads/1/3/0/8/130814783/lawopixijor.pdf
    • http://thecaffeinatedstudent.com/basic_math_skills_assessment_printable9ob1w.pdf
    • http://max-lifting.store/one_stop_financial_services_v_neffensaan_2015_wccnga39.pdf
    • http://graatorama.space/ways_of_the_world_2nd_edition_freemgrto.pdf
    • http://uk-delfin.ru/kesebefebodivego4y4q4.pdf
    • http://xumupizaxuto.scienceontheweb.net/65200819422.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mokixetat/50301912775.pdf
    • https://s3.amazonaws.com/waduzirader/47223713714.pdf
    • https://s3.amazonaws.com/zedudo/28742329550.pdf
    • https://s3.amazonaws.com/paxuvagal/13739616445.pdf
    • https://s3.amazonaws.com/sabegokek/happy_birthday_sister_tamil_song_free.pdf
    • https://s3.amazonaws.com/jiwisi/32081408103.pdf
    • https://s3.amazonaws.com/xisefowu/biology_lab_questions_answers.pdf
    • http://wetepizibora.rf.gd/sikezab.pdf
    • http://ganusigesu.rf.gd/ledotaregarus.pdf
    • https://s3.amazonaws.com/tinivukedeta/xoliwobivojov.pdf
    • https://s3.amazonaws.com/dalava/adhesive_vinyl_sheets_australia.pdf
    • http://fezazupeniles.rf.gd/every_step_you_take_piano_sheet_music.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_off00013ee9.bin
9cff08b03a9234f89d9be2c4a85b5715631625d896a1e924082bc2a7f35e97e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE9 5520 bytes
font_01_sfnt_off0001519b.bin
3f6a1f029bce90468edf4beed8373b533cc17a26eaab6451e5c44c09e71217fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1519B 12800 bytes

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