Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a317d5f15407a0b…

MALICIOUS

PDF

73.6 KB Created: 2021-03-19 01:28:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: bf50fe124fdbc6d088dc1fbdb092ab3a SHA-1: e262cbc240bbd1c88678c8b96f1dad6448b44a41 SHA-256: 6a317d5f15407a0b916a14b68d0ca7ce029ceb1184658d20eb3618564a8ba9fc
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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.
  • 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://botokaw.ru/123?utm_term=android+get+bitmap+from+vector+drawable PDF link annotation
    • https://gorejirulikem.weebly.com/uploads/1/3/4/7/134738880/6700508.pdfIn PDF document text
    • http://dazolovegom.mygamesonline.org/9665385368.pdfIn PDF document text
    • https://kixivoveluvib.weebly.com/uploads/1/3/0/7/130775150/5728968.pdfIn PDF document text
    • https://cdn.sqhk.co/nikajovefer/aLCiehh/87748986785.pdfIn PDF document text
    • https://cdn.sqhk.co/lasesekov/dA6opgf/45331838438.pdfIn PDF document text
    • https://cdn.sqhk.co/sozivowemin/fApFg4f/92417479573.pdfIn PDF document text
    • https://cdn.sqhk.co/silinetufid/j1ACjdR/22445871350.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvazuginu/acIWu2h/1878413977.pdfIn PDF document text
    • http://sopisafexuj.sportsontheweb.net/3_storey_school_building_design.pdfIn PDF document text
    • https://waneratamif.weebly.com/uploads/1/3/1/4/131436972/7597969.pdfIn PDF document text
    • https://cdn.sqhk.co/tarozawowe/iahdgik/police_cars_ambulances_and_fire_engines.pdfIn PDF document text
    • https://cdn.sqhk.co/kosojilufut/hnibraf/black_screen_of_death_ps4.pdfIn PDF document text
    • https://cdn.sqhk.co/wapadofiwe/ijf1hbJ/crayon_template_powerpoint.pdfIn PDF document text
    • http://delinapod.mypressonline.com/hp_elitedesk_800_g1_mt_desktop_pc_power_supply.pdfIn PDF document text
    • http://mokemowowove.mygamesonline.org/96018987317.pdfIn PDF document text
    • https://pakitaxe.weebly.com/uploads/1/3/4/3/134318313/kedesojovu.pdfIn PDF document text
    • https://cdn.sqhk.co/zubuwebofe/Ya37pAZ/arduino_uno_iot_kit.pdfIn PDF document text
    • https://sefewazugep.weebly.com/uploads/1/3/5/2/135293251/5722965.pdfIn PDF document text
    • http://vanimerukaguto.scienceontheweb.net/introduction_to_computer_science_book.pdfIn PDF document text
    • http://tipijijajofupi.sportsontheweb.net/approaches_to_curriculum_design.pdfIn PDF document text
    • https://cdn.sqhk.co/kosifodalab/d4gcihh/does_airport_scanners_detect_pregnancy.pdfIn PDF document text
    • https://cdn.sqhk.co/nanagajog/phdzA28/gefetuwijaxigepodubataf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://dugerem.atwebpages.com/94172783195.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EF 5368 bytes
SHA-256: 8b6ce4a0be3d8ced1ace21e91e87906687f84fa142cfa488d807b6e95c228e2d
font_01_sfnt_off0000e624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE624 10544 bytes
SHA-256: c258b75ed626ab53487ecc00ff8bf31cc65ea1be3c068d3ca39dda2094ac4455
font_02_sfnt_off00010a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A52 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3