Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1ef21b851c13e95…

MALICIOUS

PDF

74.3 KB Created: 2021-05-15 04:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 40b525ebf40959c7aa1d47e9affed037 SHA-1: 8052287868af7264e8df870581960858d79053d5 SHA-256: c1ef21b851c13e95cdf2f6db1a0b5ae23c16f8e95dab018fa2fc599cc7c17cd9
126 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. The document body, though partially corrupted, suggests a lure related to a popular audiobook title, likely to entice clicks on the embedded malicious links. The presence of multiple external URIs and link farm heuristics further supports a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://midufefew.ru/strik?utm_term=artemis+fowl+the+time+paradox+audiobook+free PDF link annotation
    • http://rerolakareruxom.22web.org/86801878403.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvuvidova/C5ifgi8/supercity_superhero_sim_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/rebabafa/haeWEhj/didefigofalap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wekumut.epizy.com/jefavixexugowepoxuvuwa.pdfIn PDF document text
    • http://dixegozep.rf.gd/john_grisham_books_dates.pdfIn PDF document text
    • http://ripifozuj.rf.gd/bruny_island_map.pdfIn PDF document text
    • http://xipobibupo.epizy.com/dieta_atkins.pdfIn PDF document text
    • https://19aaccd0-9772-41b6-85c4-be118606641a.filesusr.com/ugd/a12125_8560aa1a3ec548b8ace220a4ec5e80f9.pdf?index=trueIn PDF document text
    • http://lawenov.rf.gd/revipasuvevuk.pdfIn PDF document text
    • https://95043331-d9de-4498-ad98-35b8ac3ee23f.filesusr.com/ugd/5740b2_c35993c8fbca40b7bfb96c71fe4751fb.pdf?index=trueIn PDF document text
    • http://fepelumemodeg.epizy.com/bujazusorur.pdfIn PDF document text
    • https://6f0a1f77-3195-4c90-aae7-8e5805bb56bd.filesusr.com/ugd/f94fd0_804867cb27ed445d88c22aa03501427e.pdf?index=trueIn PDF document text
    • https://b9ecad59-ee1c-469f-8402-ddbad3bf215f.filesusr.com/ugd/84dab8_5078ca27bf2d4e668328d2309d806501.pdf?index=trueIn PDF document text
    • http://jujeludapivibiw.rf.gd/astor_piazzolla_guitar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4598d8fe-0314-4c78-8c32-4d2b506eda29/85826790809.pdfIn PDF document text
    • https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_09f732303c1545e380c9e3fc85fb58d0.pdf?index=trueIn PDF document text
    • http://xugadizedema.rf.gd/sidurajitefe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/927349d5-40f7-43cd-adcc-64ff45755dac/lukugamexibawulutunof.pdfIn PDF document text
    • http://rawozovikoruros.rf.gd/99_names_of_allah_free.pdfIn PDF document text
    • http://kotimopinurixig.epizy.com/70915817692.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_off0000e3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3ED 5632 bytes
SHA-256: 18f41c56dac3a6e2aacc6c578112eb05c925bd48af0c7c8d238a823553c12518
font_01_sfnt_off0000f6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F3 10732 bytes
SHA-256: 102dbac00824018614896ab14f0e74320fb896df058f367540e56997e1d35aaf

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