Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d0bae77284dea39…

MALICIOUS

PDF

71.7 KB Created: 2021-06-07 11:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da0fec3ca99b2e131320aea09f9db16f SHA-1: d12a9ea360b1bc9b0aaa9349e4626f97aa40fdf9 SHA-256: 1d0bae77284dea3920b7311a2b700f9fceb5f72d6a1ff036aca89c7709f74178
126 Risk Score

Malware Insights

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

This PDF document contains numerous embedded URLs, with one specifically pointing to 'crewmak.ru' and a query parameter suggesting a download lure for an Android video call app. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing campaign designed to trick users into downloading potentially harmful software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/pbw?utm_term=download+video+call+app+for+android+phone
    • https://static.s123-cdn-static-d.com/uploads/4418558/normal_60b5782b28434.pdf
    • https://cdn-cms.f-static.net/uploads/4495399/normal_60b8a3a068ef3.pdf
    • https://sadaxolofomet.weebly.com/uploads/1/3/1/4/131453623/6903daa2ee4.pdf
    • https://cdn-cms.f-static.net/uploads/4389603/normal_60bbe12c0e523.pdf
    • https://nelubetif.weebly.com/uploads/1/3/5/3/135322580/nimesafaxevow.pdf
    • https://static.s123-cdn-static-d.com/uploads/4486537/normal_60b07a14a3e22.pdf
    • https://cdn-cms.f-static.net/uploads/4501501/normal_60b7b7bd5619c.pdf
    • https://static.s123-cdn-static.com/uploads/4417315/normal_5ff0e61485a78.pdf
    • https://detalejutapebis.weebly.com/uploads/1/3/4/6/134610814/6df5d7.pdf
    • https://jitugitux.weebly.com/uploads/1/3/0/7/130740190/9928997.pdf
    • https://static.s123-cdn-static-d.com/uploads/4485695/normal_60b50394e35b5.pdf
    • https://kimivatebuxokas.weebly.com/uploads/1/3/4/7/134702804/foruten.pdf
    • https://ruvutitijo.weebly.com/uploads/1/3/4/8/134883381/wozizopofutalivi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b659c074-1ee3-4237-8fae-8468a0d7c233/will_there_be_a_fourth_divergent_book.pdf
    • https://uploads.strikinglycdn.com/files/80a7011e-28b2-4582-87a0-8d52649429b3/quasi_poisson_vs_negative_binomial_regression.pdf
    • https://uploads.strikinglycdn.com/files/26412335-79df-4c28-b695-b8c2a443dda3/how_to_take_firework_pictures_with_nikon_d3400.pdf
    • http://redelaw.pbworks.com/w/file/fetch/144553326/1933_chemical_formulary_book.pdf
    • http://bezawagiga.pbworks.com/f/reruwusawofufugava.pdf
    • http://pugaxigodaka.pbworks.com/f/17421245644.pdf
    • http://zekodunu.pbworks.com/f/26260097974.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db3a.bin
d0116af53871a5d628f2d9ceb4fc774157a0952010f33fefb8d90fd1185ce6f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3A 5216 bytes
font_01_sfnt_off0000ed15.bin
7e7a93ae15ba64db3ac77e35cb5533dc956b832fcd3e6b4dc656280ca0cb36ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED15 10156 bytes

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