Malicious PDF — malware analysis report

Static analysis result for SHA-256 b12701e3c6eacb4c…

MALICIOUS

PDF

81.5 KB Created: 2021-04-30 13:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 44d5f39f00743c3aa71060b43598c560 SHA-1: 793b022a4b52b13bbae2947956efcbd751d0d831 SHA-256: b12701e3c6eacb4c7cb4554bcbe7044d6b2382e69ab3457f3f0401de0ee0b98c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many hosted on disposable domains or link farms, indicating a likely SEO spam or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs and the structure of the PDF point towards an attempt to redirect users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://botokaw.ru/strik?utm_term=behringer+xenyx+1002b
    • https://cdn.sqhk.co/jabakujivim/gcuEiac/crash_team_racing_toys.pdf
    • https://nejavedejelije.weebly.com/uploads/1/3/4/3/134336697/rerefoniki.pdf
    • https://cdn.sqhk.co/vugujebeku/eidE4PZ/wuvom.pdf
    • https://vonefemupeme.weebly.com/uploads/1/3/5/9/135957005/doditoru.pdf
    • https://cdn-cms.f-static.net/uploads/4393186/normal_6028721b2ca0c.pdf
    • https://nufapapezo.weebly.com/uploads/1/3/0/9/130969462/tojase.pdf
    • https://zadidiboz.weebly.com/uploads/1/3/5/2/135295834/wuzolusokub_wobofadovefaxu.pdf
    • https://vukivogo.weebly.com/uploads/1/3/5/3/135329669/dedopugixowala.pdf
    • https://sujegido.weebly.com/uploads/1/3/4/6/134695044/vaxipaxoj_zofusivibor.pdf
    • https://cdn.sqhk.co/vanewano/ichbRjb/pokupibaxarutefigunurek.pdf
    • https://bosofivi.weebly.com/uploads/1/3/4/6/134668799/4535545.pdf
    • https://cdn-cms.f-static.net/uploads/4407562/normal_603fb47dea0fd.pdf
    • https://cdn-cms.f-static.net/uploads/4375204/normal_602c3fbf950d8.pdf
    • https://bunofavaluz.weebly.com/uploads/1/3/4/6/134661637/nonijetakefa-sojenubagino-bemofiwojej-jefej.pdf
    • https://static.s123-cdn-static.com/uploads/4426425/normal_6001f8ce20b56.pdf
    • http://poniwipojoxowo.22web.org/maxazujekunar.pdf
    • https://static.s123-cdn-static.com/uploads/4415524/normal_5fe1b25f38be9.pdf
    • https://cdn.sqhk.co/rowazazapa/gegi62R/juice_wrld_splash_2019_tour_setlist.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wetafemef.epizy.com/lobuzapadobupaxefinamale.pdf
    • http://dudowowadoz.rf.gd/beethoven_moonlight_sonata_sheet_music_amazon.pdf
    • http://logupenevetisi.epizy.com/dupepuzimupi.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_off00010256.bin
1615caa3b1992294a08693844cea091f7e6f6618792ff5f860c6958efe0db995		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10256 5212 bytes
font_01_sfnt_off0001142a.bin
bd9d96a4b3635e16635798861d93845d2be42cb13d521030cdc211c498563f48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1142A 10824 bytes

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