Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b5d11e99a94f8f…

MALICIOUS

PDF

82.3 KB Created: 2021-04-13 23:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 00998bb23846ae2d36b2c1fc22025aee SHA-1: 205759cf72baa23721326034426d9fea08b18295 SHA-256: f1b5d11e99a94f8fc158539664e0e965086f0b801e213e75c39e1417813dfccc
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains or free hosting services, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing malware. The embedded links are the primary indicators of compromise, suggesting the document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/strik?utm_term=hypertherm+powermax+65+error+code+0-99 PDF link annotation
    • https://cdn.sqhk.co/gogerazina/icORCgh/vatomir.pdfIn PDF document text
    • http://fodadasome.iblogger.org/sunowewozuf.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/hhjdhid/43068504625.pdfIn PDF document text
    • https://ropedali.weebly.com/uploads/1/3/0/9/130969406/01d8ac.pdfIn PDF document text
    • https://cdn.sqhk.co/teduwugevoki/dhgqKhd/soccer_star_java_game_download.pdfIn PDF document text
    • https://zivixitusinuz.weebly.com/uploads/1/3/1/3/131380786/kuxajafaruvasej.pdfIn PDF document text
    • https://meripowubizaj.weebly.com/uploads/1/3/5/9/135959363/suwupudebo-fujewaxawaba.pdfIn PDF document text
    • https://cdn.sqhk.co/sevigexew/hjzl923/word_games_to_play_with_friends_on_phone.pdfIn PDF document text
    • https://pufoxedoj.weebly.com/uploads/1/3/4/4/134438994/8acbe36f7ed765c.pdfIn PDF document text
    • https://dapalirodo.weebly.com/uploads/1/3/1/4/131483520/tejibosoxe-xozukozinujexed-galivaranepa.pdfIn PDF document text
    • https://mirenixumevi.weebly.com/uploads/1/3/5/3/135309561/3991847.pdfIn PDF document text
    • http://vasuxarogaxatix.iblogger.org/pipakiwogiroferamegi.pdfIn PDF document text
    • https://lukejofavum.weebly.com/uploads/1/3/4/4/134455809/4750414.pdfIn PDF document text
    • https://gopebuxagofu.weebly.com/uploads/1/3/2/6/132681698/biwofodo.pdfIn PDF document text
    • https://cdn.sqhk.co/xeloxilava/AoJhcQK/95031013846.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://najubizep.epizy.com/zusifirejurowovovakuxagum.pdfIn PDF document text
    • http://butomepa.rf.gd/christmas_canon_piano_sheet_music_free.pdfIn PDF document text
    • https://4868a29a-6d77-448d-a9c5-bc5c6a1713c3.filesusr.com/ugd/060e50_90e04c1fe23e402ba755e78463628b9f.pdf?index=trueIn PDF document text
    • https://61df3396-90b5-4b69-a3ae-475c9da6ebc5.filesusr.com/ugd/516574_b234e5ab27464364a655247304908431.pdf?index=trueIn PDF document text
    • https://6648aa49-deb3-4d6f-81a8-a63cc7a297fb.filesusr.com/ugd/38eac1_5af3388cbdf94858bdeda369c538f354.pdf?index=trueIn PDF document text
    • https://d872ce2a-2baf-4032-ab86-ab75b2f66d52.filesusr.com/ugd/338562_8e01382f07e44c0b9623e53eac607240.pdf?index=trueIn PDF document text
    • https://457cefd1-268f-49c0-9ca4-ced5ac281e6b.filesusr.com/ugd/983758_87d066e8e244469794e986e13b44f2f9.pdf?index=trueIn 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_off0000fe25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE25 5932 bytes
SHA-256: 22e39b660ddd52794f766a575e5dae32b38902b36399c54f42baa96405b9d37e
font_01_sfnt_off00011250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11250 12360 bytes
SHA-256: 684f27ac1773416d804ad0a0911079261012409af2f002c47fd10b900a07ca89