Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac047b4e50677ce…

MALICIOUS

PDF

75.2 KB Created: 2021-03-05 07:47:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d06155fac046f8fda07d4163bc22c617 SHA-1: 52c5d5dbd893fdbd8b6dae39b397f4b9c321e1ad SHA-256: fac047b4e50677cef004192d8b9064a08e0976e54ef7dc181f1071609b1b9b5c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a significant number of external links, with many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified the file as malicious, specifically a phishing or trojan variant. The presence of numerous external URIs suggests an attempt to distribute or redirect to malicious content.

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/award?keyword=love+story+movie+telugu+teaser PDF link annotation
    • https://balawuwugo.weebly.com/uploads/1/3/4/6/134622143/jikugabitotulon.pdfIn PDF document text
    • http://madusotiju.22web.org/buy_linoleum_flooring_sheet.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/can_you_notarize_for_a_family_member_in_georgia.pdfIn PDF document text
    • http://miromawetibikew.mywebcommunity.org/43894264326.pdfIn PDF document text
    • https://sobiwololisa.weebly.com/uploads/1/3/0/9/130969717/e7bc425b6e4c92.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lofese/tulogibararixunu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf443785-eac5-4a9e-b0cc-7ebc41c35b28/godugekixujukapajetos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e4be6ca-4fa6-4090-b5bf-29d456a0a8b9/jirobagaxeget.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07b1ebbe-af5d-4870-b193-4556fae523d2/koguvurinabajumas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28610175-7fa4-4db9-ba7a-e0cf272d954e/87463641592.pdfIn PDF document text
    • http://megoxisega.epizy.com/how_to_mix_quinacridone_magenta.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/varisedepilomo.pdfIn PDF document text
    • http://resisimokopi.epizy.com/51394784119.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78244338-9bad-47d9-b0e2-6a3922ccaee4/quotes_about_mental_toughness_in_basketball.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b20ea9b6-6db4-46ff-b94d-b9a696c4eed3/identidades_trigonometricas_cotangente_al_cuadrado.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_off0000ec02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC02 5108 bytes
SHA-256: 2fd3915f9d3b6dc024685d71551130fd8100ba58223923d3460915458e08a427
font_01_sfnt_off0000fd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5E 10208 bytes
SHA-256: d7034119ebb350cbcf8552efba5759cfe9015309bc81eb6522ef0bea32fd4cc6

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