Malicious PDF — malware analysis report

Static analysis result for SHA-256 660d5b36a6d147d4…

MALICIOUS

PDF

72.7 KB Created: 2021-03-13 22:03:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 198dd5bc1b8b77fcf0a1184fdcbf8d9a SHA-1: 25662fd31f5cb7c83dfd06496c88c03c93c5ed68 SHA-256: 660d5b36a6d147d45cb518b38755dbb9bc7b0d95158c3a21b784047db38d1ad1
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by multiple heuristics, including ML and ClamAV, as malicious. The document body, though heavily obfuscated, appears to be a lure related to a search query, directing users to a suspicious URL. The presence of external URIs and the link farm heuristic suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/aws?utm_term=what+biome+is+indiana+located+in PDF link annotation
    • http://kugoxenanawugud.22web.org/what_does_whatever_tickles_your_fancy_mean.pdfIn PDF document text
    • https://rinuvigilositu.weebly.com/uploads/1/3/4/4/134463450/zoxivugamiludawoxos.pdfIn PDF document text
    • https://zuverefexogi.weebly.com/uploads/1/3/4/3/134316215/e8fcc846.pdfIn PDF document text
    • http://tevajevidiwa.22web.org/19673373816.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/wumodukubaru/russian_accusative_case_exercises.pdfIn PDF document text
    • http://zalufebali.rf.gd/oecd_guidelines_for_multinational_enterprises_2011_summary.pdfIn PDF document text
    • http://fovodikil.rf.gd/32804789881.pdfIn PDF document text
    • http://zijodere.rf.gd/zodal.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/american_beauty_full_movie_filmyzilla.pdfIn PDF document text
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_6cbd4ab8ae4c42329a90f094a8a6e5c1.pdf?index=trueIn PDF document text
    • http://serivisaruwe.epizy.com/xumasavulutirivixazaxix.pdfIn PDF document text
    • http://vojevawe.epizy.com/advantages_and_disadvantages_of_transformational_leadership.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e38c7eeb-769b-4f9b-95ed-29fc8f9e8b49/zasolame.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/892d78a6-9bf3-4f0a-aba5-f50c11b0de1e/lixovixitiruru.pdfIn PDF document text
    • https://c480cc3d-c044-45b7-a7fa-747782367dcd.filesusr.com/ugd/a26f59_0d8ac3c2c0144569b2a79533d5023917.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4cc6022-b4e2-4a34-b0bb-d361b5e95125/7453670042.pdfIn PDF document text
    • https://ecfc1f44-6648-4072-bff5-6ee4adcfbe4f.filesusr.com/ugd/e5a943_c0292e019d3d45cbb7970b3d819f1b6c.pdf?index=trueIn PDF document text
    • http://lovikusikew.epizy.com/chen_tai_chi_18_form_explained.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_off0000deae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAE 5236 bytes
SHA-256: bb195857150c0c0a88e9a305cf586728c37872beb642bc715c6c81573e88da18
font_01_sfnt_off0000f05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05F 11020 bytes
SHA-256: 54f2f58dd7f4d7aa900abc99f5d694689f4f5c6a8d531262899abefa88dacc4b

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