Malicious PDF — malware analysis report

Static analysis result for SHA-256 48140c8a07b36fb1…

MALICIOUS

PDF

81.1 KB Created: 2021-03-20 07:00:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a9ace04a1aac30780bb6dbe6d70bbcd3 SHA-1: bc6e4543f824821b7cf0483f86cffe690ed700f0 SHA-256: 48140c8a07b36fb11502d3dd94c1c8922430f29f298d13c7d8093b74244d0f37
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to drive traffic. The embedded URL 'https://jacksth.ru/wix?keyword=pou+hack+apk+free+download+android' indicates a lure for potentially unwanted software. Heuristics like 'PDF_SEO_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly indicate malicious intent, likely phishing or malware distribution.

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
  • 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://jacksth.ru/wix?keyword=pou+hack+apk+free+download+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465025/normal_603632fcd7f21.pdfIn PDF document text
    • http://arbitestpark.xyz/how_to_use_imovie_for_dummies9yqzf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404980/normal_5ff8538bb5f6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496577/normal_5fcb7bbd0dfc9.pdfIn PDF document text
    • http://geniusenglish.space/airtel_xstream_4k_android_box_launched2h4sn.pdfIn PDF document text
    • https://cdn.sqhk.co/xaripisi/jajji7X/67901958525.pdfIn PDF document text
    • https://cdn.sqhk.co/batijuretak/hLhhhaE/best_vr_games_for_oculus_quest_2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490920/normal_6007bf28efd80.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388276/normal_5ff5cbdc3b518.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/a47hbhb/3663928193.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/509188aa-d860-476e-af1b-90caef78dcd2/firegiri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a809d1f-3c19-47cf-9d42-2cb4edf797ee/wifipozalovij.pdfIn PDF document text
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_3b34dfb971e6420fa538a2fd3ef18cbe.pdf?index=trueIn PDF document text
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_1a35d9c697d14a2097a64d79b6a698ba.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/166e2178-f611-4b64-a930-5ee2a9fda9f3/somapujorasudavo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0349b342-1952-4a9b-8601-3a9bcc38e734/vepajobepubogiterebupojo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bd836b3-ba8d-48d5-ab82-19678a77c29d/17916695363.pdfIn PDF document text
    • https://0cfe495c-9a5f-46a1-a5f3-fb21b6211bac.filesusr.com/ugd/7aabb2_1ab86e55808f460b83550c35fd515dc8.pdf?index=trueIn PDF document text
    • https://29c5b005-6627-40e3-9da1-9f9d3dbc34dc.filesusr.com/ugd/7ad284_3cd936a0e72f4ad38c5590cd07363b42.pdf?index=trueIn 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_off0000f395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF395 5224 bytes
SHA-256: d4251468665c2dd67d3dad04b4199f01c5c460b2b7f29b1170952cd43b121ba5
font_01_sfnt_off00010568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10568 22392 bytes
SHA-256: 08a850d7b2b54c1dfa6599a690dc7f619f9e1d1bf4feb73fcde4980a29b2f950