Malicious PDF — malware analysis report

Static analysis result for SHA-256 9788975dfe41730c…

MALICIOUS

PDF

79.0 KB Created: 2021-05-18 05:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1793e7a7a0e5f27b5710228b61db60ba SHA-1: c5f07f8087247fca995363629eb9bcb8f38008df SHA-256: 9788975dfe41730c7949bc4b8d78b8de4a196bbdfe994b14a76b720d983d368c
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains heuristics indicating it is a link farm designed to trick users with a fake CAPTCHA, leading them to external URLs. One such URL, 'https://golowaki.ru/strik?utm_term=resident+evil+3+apk+no+verification', suggests a lure related to game downloads. The presence of multiple external links and the ML classifier's high confidence score support a malicious intent.

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/strik?utm_term=resident+evil+3+apk+no+verification PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417405/normal_6033622e67444.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369191/normal_5feb9f41eecdc.pdfIn PDF document text
    • https://biwizodem.weebly.com/uploads/1/3/4/6/134650183/xitubuwixafijexirila.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467300/normal_5feed62f2f01c.pdfIn PDF document text
    • https://betamomaj.weebly.com/uploads/1/3/2/6/132695924/7610348.pdfIn PDF document text
    • https://najigojuvunijo.weebly.com/uploads/1/3/0/8/130874658/lelosu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xafafogaditeki.rf.gd/70962734734.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/autocad_autolisp_developer_s_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6ef2fca-6256-4f43-9995-2dd21c7d214d/xepolumopajakuwure.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/40912943688.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6efee594-5201-4c26-9f7a-409b8541ea2f/jegojogefozex.pdfIn PDF document text
    • http://tedijafubivot.epizy.com/fuzejefezurerigu.pdfIn PDF document text
    • http://katezoluvezile.epizy.com/44289304910.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f1390eb-4ff8-43ea-a55c-eb5ca7785e38/sasumewasoweduneborag.pdfIn PDF document text
    • http://zumoriko.epizy.com/tufuleluvixiwunijisupugix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bd45b1c-5fb2-4f59-bc6d-a46be2dee17d/is_braun_epilator_good.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7b9b1b8-8b89-4b88-9b97-8dd4c0dc945d/ferrari_812_superfast_engine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4c0bc14-aae4-456f-9593-19f0a4b17bf9/your_grace_is_enough_matt_maher_guitar_chords.pdfIn PDF document text
    • http://zadosuwiwebuw.epizy.com/16777319026.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB01 5232 bytes
SHA-256: 8b56ee7b6dd87ff6e03c616d3c943dfb2a6f9c8d52ca40ff0775bf233c423050
font_01_sfnt_off0000fcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDE 10400 bytes
SHA-256: 0b135f2c3c27beef44a2e940491b18ea4ad3af1eee5a521eb3c635cf8e4d9ac7
font_02_sfnt_off000120b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B1 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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