Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a27f2672f676369…

MALICIOUS

PDF

78.4 KB Created: 2021-03-06 16:08:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b5841d1f6acdc818d5b50f516200439c SHA-1: 73ed4fec92c46b938b78e9f8d4fc4c98bd05eef5 SHA-256: 8a27f2672f676369c70e7224be85941e46040f9804a978dd688b6fb43db3dd42
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a deceptive structure for traffic redirection.

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://druttle.ru/award?keyword=latest+jack+reacher+novel+by+lee+child PDF link annotation
    • http://gitamoravazini.22web.org/shakespeare_sonnet_analysis_15.pdfIn PDF document text
    • https://nunonugo.weebly.com/uploads/1/3/4/3/134309936/c1fe70e25.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480173/normal_5fc7e9dfbf8c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455180/normal_5ff47099b3a28.pdfIn PDF document text
    • http://xeverekenov.22web.org/20430653672.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409630/normal_5fdab10540570.pdfIn PDF document text
    • http://probkin34.xyz/how_to_set_the_time_on_my_g_shock_323087x8w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420432/normal_60358296aa2e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370051/normal_600dbd00273d6.pdfIn PDF document text
    • http://gimepar.22web.org/96562107464.pdfIn PDF document text
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/tegimerupuvikar.pdfIn PDF document text
    • https://sovirolozemeze.weebly.com/uploads/1/3/4/3/134337586/zajinasenenakuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391920/normal_6013312caca05.pdfIn PDF document text
    • http://winclean-shop.space/robots_coop_apkas4uj.pdfIn PDF document text
    • http://english-10.site/redowufolazsqgh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450638/normal_5fe2ef06c98ee.pdfIn PDF document text
    • http://zavemobavozake.22web.org/zinanajuropizoxoxuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pewusufep.epizy.com/maa_brahmacharini_images_hd.pdfIn PDF document text
    • http://zisafarur.epizy.com/suvipexavef.pdfIn PDF document text
    • http://mebagazedovozep.epizy.com/16673036435.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_off0000f720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF720 5412 bytes
SHA-256: 1f54af6c5e44603739e08c459a8dae3b0cb527e4c0287f862bc5961b3e87abe7
font_01_sfnt_off00010992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10992 10148 bytes
SHA-256: 49afda5c6f56a4a4c1c1aa9ac1b351c89079b907da127423e6f9097211849ea8

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