Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cd3571b0fea24a0…

MALICIOUS

PDF

84.0 KB Created: 2021-05-31 13:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 212ee9f559a6c7c405c83e7a14db40e6 SHA-1: 2ef53dd015c4b30df64d557063720849a5bd0d53 SHA-256: 8cd3571b0fea24a0495759b0ba45ddad7f97d9b676bb9d376ecfceda9ee2a811
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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/strik?utm_term=mouse+trap+game+instructions+milton+bradley PDF link annotation
    • https://zojevobe.weebly.com/uploads/1/3/1/1/131163992/duloraxit.pdfIn PDF document text
    • https://sudusiwigi.weebly.com/uploads/1/3/1/0/131069987/tiwiloluvugara-ruzevukuja-sotukoporaki-mixolajivedo.pdfIn PDF document text
    • https://powadurax.weebly.com/uploads/1/3/4/6/134621507/liniditexa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496001/normal_6002c69839dfe.pdfIn PDF document text
    • https://mojivisosodarez.weebly.com/uploads/1/3/4/0/134096231/3644064.pdfIn PDF document text
    • https://dikefurilixi.weebly.com/uploads/1/3/4/6/134684794/dbcc96.pdfIn PDF document text
    • https://lubikumak.weebly.com/uploads/1/3/1/4/131453733/9310402.pdfIn PDF document text
    • https://gifuliranofave.weebly.com/uploads/1/3/0/8/130873810/fagisofut.pdfIn PDF document text
    • https://gufofusubovara.weebly.com/uploads/1/3/5/3/135323195/3277224.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497078/normal_5ff000ef64391.pdfIn PDF document text
    • https://nefitajufu.weebly.com/uploads/1/3/4/7/134712437/4944470.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/7061bdd7-616d-4836-a50f-cecc8cc6c08f/31916902184.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82604734-68fa-4271-ba58-48bfc2e94a9a/ejercicios_resueltos_descomponer_en_factores_primos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/baaf9ff2-0bdd-4f13-92fb-7ae1682b4ea1/world_conqueror_3_mods_glory_of_communism.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28aa4d97-578c-424b-90d5-844c3c9fbfc1/satipatthana_sutta_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d18f6193-7e26-4685-8a87-fb1b6f787229/percy_jackson__the_olympians_the_lightning_thief_2010_full_movie_in_hindi_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47dfc7c5-5d3d-44b9-a37b-df929a3853c9/49641911781.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d38b366-f450-4e02-b4ab-8e3830cfb3fd/94619089719.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2770cfc-f46a-4d23-b0a5-98cd2be05052/what_foods_should_i_avoid_while_breastfeeding_a_baby_with_eczema.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28e406eb-42c8-4644-8594-1c42d04bb095/41196955947.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_off000103f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F1 5640 bytes
SHA-256: 60ed687d200a6ba6ed1f1fed3035b0acb2654ab2752539af480f530cb5ba169c
font_01_sfnt_off00011718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11718 12428 bytes
SHA-256: 3562f82cd136b94b43108c3d21472baf7d729204a84818ca1436c17f2d3f5ba9