Malicious PDF — malware analysis report

Static analysis result for SHA-256 db1c530c5058d90e…

MALICIOUS

PDF

85.7 KB Created: 2021-05-22 06:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: acaa6f0a0b406a96734b6ce315f8a23f SHA-1: c6d980c83ad870f2e93f27b797dd8d2797b5cbff SHA-256: db1c530c5058d90e34835b140c32064f7616afa96cc7ba27690dbcea4c65e002
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an MFA/2FA-themed lure. 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 0.9994

Heuristics 7

  • 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://crophysi.ru/strik?utm_term=battleclaw+game+beast+generator PDF link annotation
    • https://tevupuzenoxa.weebly.com/uploads/1/3/6/0/136009769/5e8709b1ab4.pdfIn PDF document text
    • https://jemexegotida.weebly.com/uploads/1/3/4/4/134464186/2fd38c83d37830.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465704/normal_601b1f8a67eeb.pdfIn PDF document text
    • https://topepixifugop.weebly.com/uploads/1/3/4/3/134322533/f10a297ead794cf.pdfIn PDF document text
    • https://jafedemigizol.weebly.com/uploads/1/3/4/5/134588438/2720582.pdfIn PDF document text
    • https://pupadidaf.weebly.com/uploads/1/3/0/8/130873798/b4c7bc37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409813/normal_604a2ef2df804.pdfIn PDF document text
    • https://gokuxevi.weebly.com/uploads/1/3/4/0/134017514/1928970.pdfIn PDF document text
    • https://bexusisase.weebly.com/uploads/1/3/4/5/134596812/lovema.pdfIn PDF document text
    • https://gizaluta.weebly.com/uploads/1/3/5/3/135345368/dodebifubatuluzar.pdfIn PDF document text
    • https://wipabobape.weebly.com/uploads/1/3/5/9/135985954/3912758.pdfIn PDF document text
    • https://koxizekeb.weebly.com/uploads/1/3/4/7/134770308/povorilevuna.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414342/normal_5fd0b4e51fb04.pdfIn PDF document text
    • https://luresigixake.weebly.com/uploads/1/3/5/2/135294948/movejelir.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/abe7d3ff-43fa-4b64-a132-89c3338c4b22/dazarigovafeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9b09d79-4290-47f3-a8c1-05cb1a220992/7588217419.pdfIn PDF document text
    • https://s3.amazonaws.com/dogevazapiwediw/how_do_i_find_the_ar_level_of_a_book.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/6248966267.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49e48a8c-7838-4a46-a347-516ae1c7102a/vaxuv.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/sat_prep_book_2019_barnes_and_noble.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/934466bc-6ebe-48de-90f9-a7daec9eb95f/30844217261.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/lapim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed9c97e9-0676-45a8-9d1d-3da506928dc7/who_manufactures_ativa_shredders.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_off0001120e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120E 5400 bytes
SHA-256: 47480069ae1b6c5be8a80e9b5b7273b784588b71027303572d00acfeac1f3b43
font_01_sfnt_off00012467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12467 10784 bytes
SHA-256: b3a89246b9c037686dbe82814437cf8d9035aa3e12d80c68adfec11240c5a1c0