Malicious PDF — malware analysis report

Static analysis result for SHA-256 8381880e42b143a1…

MALICIOUS

PDF

69.5 KB Created: 2021-04-04 13:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0c36ef82756dd2bd9aeae96f5ff4ebce SHA-1: 80effe0078df7a53155979d7d582e3189490d138 SHA-256: 8381880e42b143a104577ee72e06cac1936a71a29f339a2414ef3cb617633b80
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://golowaki.ru/wix?keyword=kappa+alpha+psi+coat+of+arms+for+sale PDF link annotation
    • http://kaguveka.22web.org/56589879309.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464709/normal_5fd0aa1c3966e.pdfIn PDF document text
    • http://coins24h.com/tedodifidgppo.pdfIn PDF document text
    • http://it50off.pro/cycles_of_matter_worksheet6ffip.pdfIn PDF document text
    • http://xavelodezazil.iblogger.org/ritozatapukitim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414358/normal_5fc5b9087985d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493917/normal_602428ff217d8.pdfIn PDF document text
    • http://idealica-italiaufficiale.site/php_rest_api_composertwhxz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464724/normal_6032cec1bc9eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393776/normal_60150db84aa45.pdfIn PDF document text
    • http://prechambre.xyz/jurekanemuloweraiv6uv.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/dcd2caa1-acc8-4d61-b215-e7a545659c72/luwirololotozukode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e6410af-0093-4508-a91b-a23d527b7298/jogafelipanozezugunorubil.pdfIn PDF document text
    • http://gamupuzif.epizy.com/84585059187.pdfIn PDF document text
    • https://96ea5dd8-6962-4d57-b29c-fb233a715e3b.filesusr.com/ugd/ac3463_41093e06d510461c89e6b812518605f8.pdf?index=trueIn PDF document text
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_b21100eeb7074d44b237b8bb79883152.pdf?index=trueIn PDF document text
    • http://xivuzadozazul.epizy.com/cerebral_palsy_physiotherapy_assessment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5ccb110-f5c9-4e26-9529-6438cb917881/descargar_la_biblia_reina_valera_1960_para_pc_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f97c937d-9678-4d8d-b9bb-420b694122df/9514373133.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4eaa4c1-becf-4cdc-9a15-999e36421f96/trade_in_amazon_fire_stick_gamestop.pdfIn PDF document text
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_ba9bc97f31b740f38768ec71e37498b3.pdf?index=trueIn PDF document text
    • https://b564fea6-732e-489f-a029-a72dc6590de2.filesusr.com/ugd/6a4619_a08d9a7c9efc4709b08d52bdb06302c1.pdf?index=trueIn PDF document text
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_d0ab5dae2e484d869cdf75d3be3769b3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/62ddd857-0275-4862-b3ae-ff332c56c32b/millionaire_next_door_formula_money_guy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d046446d-4ef8-41fd-9bca-999374443dfb/do_subaru_6_cylinder_engines_have_head_gasket_problems.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_off0000d2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B3 5224 bytes
SHA-256: d45ed66e3a929549dc3682c37063ea8f1477433e1fda6b3f6a91fae98ffb2837
font_01_sfnt_off0000e455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE455 10648 bytes
SHA-256: e271d3ed56fe5fe1b8f00e8ef3fcefca521057fbe3242847de8868aaced986b7