Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39248f51774ac51…

MALICIOUS

PDF

84.9 KB Created: 2021-03-10 20:16:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 926851282d028dc3262a4d607c8e6ef3 SHA-1: c0eb515a8f3fb91ac1269b1850ef88213c28776b SHA-256: a39248f51774ac5137229d8c5072d99920369a5d7da5f0cd3a998b74f1490349
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious content designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://fokemale.ru/award?keyword=becoming+nigerian+elnathan+john+pdf+free+download PDF link annotation
    • https://puxefulido.weebly.com/uploads/1/3/1/3/131383426/woxaxa.pdfIn PDF document text
    • https://wazaxilam.weebly.com/uploads/1/3/4/7/134726650/tenav.pdfIn PDF document text
    • https://bolomekedi.weebly.com/uploads/1/3/4/7/134769876/vajonipujapekota.pdfIn PDF document text
    • http://jiresumojunivup.22web.org/anganwadi_worker_form_delhi.pdfIn PDF document text
    • https://nedamekiwuj.weebly.com/uploads/1/3/1/3/131379605/1292904.pdfIn PDF document text
    • https://fetevosave.weebly.com/uploads/1/3/1/4/131438058/biregal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tufomatewivade.rf.gd/como_pasar_milesimas_de_pulgada_a_milimetros.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/30217482428.pdfIn PDF document text
    • http://zobabof.epizy.com/38088029981.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/chicago_manual_style_footnotes_guide.pdfIn PDF document text
    • http://fewasav.rf.gd/55838906074.pdfIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_e904faed97444762a30a6051c74295f0.pdf?index=trueIn PDF document text
    • http://wepaxilex.epizy.com/animals_sounds_and_pictures_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/93339725095.pdfIn PDF document text
    • http://serozefa.epizy.com/87206873692.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d042e84-101b-49a6-8d38-d37425f10b60/24753893177.pdfIn PDF document text
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_09b0dca091454a0ba4cc3b772b61d93c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/22453bb1-8cb6-49b4-b069-53eab4b90766/cfop_method_pll.pdfIn PDF document text
    • https://2703069b-a6ff-4ff9-983c-db139a8d76ba.filesusr.com/ugd/8b61cf_02def433ab874362bede42383a4ac610.pdf?index=trueIn PDF document text
    • https://77ac2d45-d533-4b4b-a85c-01e81860bff9.filesusr.com/ugd/7f1ad7_2fc0a616988641cb92cca1f1cc3fd897.pdf?index=trueIn PDF document text
    • http://tokilofi.rf.gd/maiden_voyage_definition_synonym.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/61024239504.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/tusafisibawikufazi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68b85ec5-ed1e-4a2f-86d6-893851e6eb87/85257872443.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FC 5608 bytes
SHA-256: 8fb82fe72475c9a5766ad99dae49ecca2b79a43b8f2460c89015a4de09a25e71
font_01_sfnt_off000108fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FA 11200 bytes
SHA-256: 182054253e50e29485888b927be1389f1fe52980a3ddd453107a43db3ee53fd6
font_02_sfnt_off00012f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6A 16452 bytes
SHA-256: dfeebb44cf16d337e82d4774cb181783b8bf2674c4649c62238462e69ef025ec

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