Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba14e44c99d73fb5…

MALICIOUS

PDF

84.3 KB Created: 2021-05-24 17:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6d69df8fe8f3cc73b91c5388013cd3da SHA-1: 32703f64798a72e3169696fef5fc20fae4b52571 SHA-256: ba14e44c99d73fb57b6470654c13cabce32e164619cfbb0891f9276ac6b2abe8
246 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. It uses brand-impersonation credential phishing. 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 0.9996

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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://pikopivani.weebly.com/uploads/1/3/4/5/134510180/6417278.pdf.
  • 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://kuzutuzo.ru/strik?utm_term=huuuge+casino+cheat+codes+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4487431/normal_601450784b2fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444853/normal_604ed365ce1f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427105/normal_5ff3350aec272.pdfIn PDF document text
    • https://pikopivani.weebly.com/uploads/1/3/4/5/134510180/6417278.pdfIn PDF document text
    • https://jezonufem.weebly.com/uploads/1/3/4/5/134581402/8679ab559c75.pdfIn PDF document text
    • https://fezapatinegu.weebly.com/uploads/1/3/4/2/134266508/zoduvazeduk_fubisozegide_pomimup_rovifabafexoru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422640/normal_6003643d04955.pdfIn PDF document text
    • https://noxatedigijo.weebly.com/uploads/1/3/4/6/134660841/kufat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476445/normal_5fcbf34ebc7c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415073/normal_6016fc920a712.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366325/normal_6000ac26bfcbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444866/normal_603779862f108.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371244/normal_6053223dbd446.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528915/normal_604d5c647d9f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466166/normal_603c67f2ecf27.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/2480f72d-0459-470c-91ca-0e17faf71f1c/where_is_marine_scout_sniper_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16bbeb2d-995a-4773-b759-485a560e644e/product_property_of_exponents_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/dipafuxe/roland_fantom_6_price_philippines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d90c140e-7558-46ae-9f64-4d4ca1fbd4fe/32037253512.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/43300139183.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/university_of_british_columbia_ielts_score_reporting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bc0cb16-e65e-4335-9be1-aa658cff782b/jejufolaridutoxa.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_off0001097d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097D 5308 bytes
SHA-256: 09f55fd83630cccdcb0d7fbed19eb4a8c4db9c0ba7eaa1dc470deb3201626821
font_01_sfnt_off00011b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8D 12636 bytes
SHA-256: 56156cdcd591d2c34cec47a4bb51cf886e8e2ef0333979350f1e7d59646d2a52