Malicious PDF — malware analysis report

Static analysis result for SHA-256 8179554784be9594…

MALICIOUS

PDF

80.8 KB Created: 2021-03-16 18:17:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1a96a7f62130b1f6c6e21a5ea8788738 SHA-1: 1710fb8e3dc3d1210a5076528dc237882c4e9724 SHA-256: 8179554784be959461c347c10f546a72eb7a4a0585d4dbac8cbb0017185de170
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. Several heuristics indicate this is a SEO link farm on disposable hosting, with many links pointing to PDFs. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

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://midufefew.ru/wix?keyword=strategic+ambiguity+refers+to PDF link annotation
    • https://cdn.sqhk.co/gorokipo/hdhaihh/25th_hocus_pocus_anniversary.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/ihjz8hc/fall_season_starts_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/gepelarawazu/jtgjgc7/zoo_virtual_tour_melbourne.pdfIn PDF document text
    • https://pidofuvu.weebly.com/uploads/1/3/0/7/130739764/5e4567ab0.pdfIn PDF document text
    • https://cdn.sqhk.co/vowibesep/Ajchgha/xfinity_race_today_results.pdfIn PDF document text
    • https://wuwenesugujiku.weebly.com/uploads/1/3/0/7/130739695/rewokibigoxikox_sapumetawenem.pdfIn PDF document text
    • https://cdn.sqhk.co/xadeviro/XEShbdi/pimagoxozumu.pdfIn PDF document text
    • https://cdn.sqhk.co/karadirimose/3IhhVih/spongebob_krusty_cook-_off_how_many_levels.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385424/normal_60144fc20ee9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481540/normal_6012dbc4665eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480145/normal_6031b085195e7.pdfIn PDF document text
    • https://vodazifuja.weebly.com/uploads/1/3/4/2/134265633/lirenevupel-kuzaxen-zunojubaparege-pavejowavina.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407781/normal_5fe18afec3549.pdfIn PDF document text
    • https://cdn.sqhk.co/bujerinalo/igeMQWB/extreme_jet_ski_rental_laughlin.pdfIn PDF document text
    • https://lexawuvake.weebly.com/uploads/1/3/4/6/134610488/naganomivoxe-bemub-dozenumumorefu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d4ca907-cad6-4754-b7f0-3edaad5dcac8/how_to_set_fireplace_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7a24d46-620b-4a80-a3fe-8d9c0e9fd9e7/nazagagizu.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/6991508052.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/especializacion_auditoria_de_sistemas_de_informacion.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/jiluxazek.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/warhammer_40k_grey_knights_painting_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b3727e8-00cd-4fea-b99f-feee20767a5d/what_type_of_water_softener_salt_is_best.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13763328-9c24-440b-83de-20c9e4ca7e4a/lomul.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/98027220629.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC95 5512 bytes
SHA-256: 2865394500a7345457fc2f17d47e9b788a4fc66f37a8d4df0095fa151b32fa3f
font_01_sfnt_off00010f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4F 10752 bytes
SHA-256: b217d7c87a871453d55bc8ad3d3b54dce95a619e25652a1f2d6ed663677ab676