Malicious PDF — malware analysis report

Static analysis result for SHA-256 badef91b9103d62c…

MALICIOUS

PDF

82.8 KB Created: 2021-03-21 01:13:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 865d3d81cb6a5068ba5747b0d9876b83 SHA-1: adb0c0a61d19ec7869e8b06e3d442a6424eb50f7 SHA-256: badef91b9103d62c0e9c8f62015c925705f309aecf8548a77a0f895511971070
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on dynamic DNS services or free hosting platforms, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/123?utm_term=formal+leave+application+for+personal+reason
    • https://molireju.weebly.com/uploads/1/3/4/6/134630509/zubetuwajon-sajil.pdf
    • https://cdn.sqhk.co/rizijuwet/6kgfzTl/packer_game_on_sirius_radio_today.pdf
    • http://xenakasewexibal.sportsontheweb.net/alrededor_de_tu_mesa_partitura.pdf
    • https://cdn.sqhk.co/wujukipako/ggiekJS/baby_word_cookie_cutter_and_stencil.pdf
    • http://giwapozolaleg.mypressonline.com/writing_task_2_sample_ielts_blog.pdf
    • https://masejufubalabej.weebly.com/uploads/1/3/4/3/134388341/tuxigileb_rugaje_rafagixajololab_tijimos.pdf
    • http://center-san.ru/facebook_marketplace_brookfielddjt7m.pdf
    • https://cdn.sqhk.co/fikalibumi/P6ij6JM/44053452860.pdf
    • https://cdn.sqhk.co/fekurisakez/hgjtgga/photomath_solver_online.pdf
    • https://lufosafol.weebly.com/uploads/1/3/0/7/130775677/tatalunipaforid.pdf
    • http://kovamuwaropepu.getenjoyment.net/22472260587.pdf
    • https://xapebetilozeze.weebly.com/uploads/1/3/0/8/130873864/1711483.pdf
    • http://femetorisufi.sportsontheweb.net/varunomuvaxilerejoze.pdf
    • http://com-servers.online/vudivesuxndxe4.pdf
    • http://gakmancreatures.ru/anemia_falciforme_pode_causar_leucemia267bl.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_0555e56ca2ff4490a1c5bf3246f12f1e.pdf?index=true
    • http://pulutugorivexek.atwebpages.com/83174284527.pdf
    • https://064d663d-f6b2-44cf-a6ad-083da5f315e5.filesusr.com/ugd/77eba6_52363f4ce8f1438e9515017be4995bf6.pdf?index=true
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_c38ac02633994b0d8b909110e618dcbb.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9a5.bin
656b4a5ae6e94130f1d3b5292010ebfd9ccace1a6f299a310e2d847c29d5bc0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A5 4964 bytes
font_01_sfnt_off00010a6e.bin
c8a0778c848b1a1806c130c4d8459b9513807dae7d5a117b71cb9ef31f5dabaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6E 10960 bytes
font_02_sfnt_off00012fb6.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB6 4324 bytes

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