Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f89621fcc8ae9a…

MALICIOUS

PDF

69.5 KB Created: 2021-06-10 11:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 19753ad4e03cc8ec36893317cd0165ff SHA-1: a1065be65cfb9519b79f0517a6ec015fca665908 SHA-256: 52f89621fcc8ae9ad3f495db4d262269bf34d8734ed5eed4074e97c5ca1926e8
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://crysiq.ru/pbw?utm_term=free+movies123+website PDF link annotation
    • https://kifenefaru.weebly.com/uploads/1/3/4/3/134327755/92edc5dc6311.pdfIn PDF document text
    • https://jowukore.weebly.com/uploads/1/3/4/8/134870909/jepudidaj-xedaf-dinuvupilisuru.pdfIn PDF document text
    • https://zotagozugub.weebly.com/uploads/1/3/0/7/130739891/6868746.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404741/normal_60485058e24ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366389/normal_601db2e4e6bb3.pdfIn PDF document text
    • https://jegolufu.weebly.com/uploads/1/3/4/6/134677495/kemuxalevimesefa.pdfIn PDF document text
    • https://fewojejano.weebly.com/uploads/1/3/4/3/134348079/4746565.pdfIn PDF document text
    • https://nisozamiroxub.weebly.com/uploads/1/3/0/9/130969329/fedid.pdfIn PDF document text
    • https://mepovokure.weebly.com/uploads/1/3/0/9/130969824/gataduw_zifuleloko.pdfIn PDF document text
    • https://gefimopawudomew.weebly.com/uploads/1/3/4/0/134017284/c1fe0001c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417536/normal_605921065bd2e.pdfIn PDF document text
    • https://xetibipu.weebly.com/uploads/1/3/4/5/134528590/wadaj.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/943e353a-7ab4-4221-8e1d-5d1c177a9c5e/87721806473.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fde22762-95c8-42ca-8692-d47896cc5e6e/xalafilevo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b93d33f-3486-40e2-b940-5b37d421e94c/4211256895.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d96e888a-c8b4-441b-8599-7cd751963f7e/46937398283.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d662da7c-7cfb-4abb-8c80-5d391858477b/integrated_grammar_exercises_for_class_10_quiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e2db39f-3b5f-4050-9e31-ce98a52883f5/angle_of_elevation_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3cf6592-73a7-4e1e-9350-133345a183c0/what_happens_when_the_economy_goes_into_a_recession.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/174cc848-3a2a-458a-a28f-cd75eff9627c/42593459305.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0a01c70-4c0d-49e8-82cd-193b9ac562c8/the_girl_with_the_dragon_tattoo_swedish_imdb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6edfb246-dbcf-4690-8bf7-1f80139e3e38/logo_designer_app_for_windows.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6044b4c1-e699-4694-b8af-9e959e958b3b/kijifupideli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f9a8b75-9d5e-421f-99ff-137ca3245fa7/56149094690.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_off0000d574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD574 5184 bytes
SHA-256: 9f4c3bf5b084ea7ac63adc36d188a51191f7e4cf76cde259814519a97be0a7ab
font_01_sfnt_off0000e71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71E 9964 bytes
SHA-256: 158ed7241b9e4d73908d51fe18167a7f720f601df3a41919c702096157090421