Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b9f397adb384049…

MALICIOUS

PDF

81.5 KB Created: 2021-03-03 03:12:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 2e7ab7644bfc2363cdf2d776d773d9c5 SHA-1: 937e4b40d857e2cb29ec0cf71b3abd41386b9e2a SHA-256: 8b9f397adb3840494ca0b7537b5b5c356a07c1bcbce0101913ba8b71ddbb7ed6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy, and the presence of external URIs suggests an attempt to redirect the user to malicious content. The document body, though heavily obfuscated, contains keywords related to printer cartridges, likely serving as a lure.

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://zajinet.ru/award?keyword=hp+7612+printer+cartridges+price PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4424036/normal_5fed13d67f2ef.pdfIn PDF document text
    • http://zadudafarom.22web.org/harsh_beniwal_video_free.pdfIn PDF document text
    • https://siputewebototab.weebly.com/uploads/1/3/4/4/134480832/lakelojigam.pdfIn PDF document text
    • http://waguzeb.66ghz.com/academic_performance_test_questionnaire.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414679/normal_603a0c5ec5883.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403143/normal_602c6a93eabdb.pdfIn PDF document text
    • http://folejaf.mypressonline.com/how_the_grinch_stole_christmas_1966_youtube_full_movie.pdfIn PDF document text
    • https://bupimapigi.weebly.com/uploads/1/3/1/3/131383283/jugufipal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gibapomidumitar.rf.gd/92086153187.pdfIn PDF document text
    • http://gajamozaxekega.atwebpages.com/sazukupeke.pdfIn PDF document text
    • http://nepogewapiw.epizy.com/mo_charge_code_manual_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/android_messages_app_macos.pdfIn PDF document text
    • https://s3.amazonaws.com/gagotaniwipure/tanub.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_off0001020d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020D 5588 bytes
SHA-256: 8e4dcf8759de452a0e24ef433f53248f03c30ea9430c6a0f0aab1d43c6f99ce9
font_01_sfnt_off00011532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11532 10472 bytes
SHA-256: 9c9a566b44556b8664c71152a9fd7f19e5830b316d19d8a9f4c36498b1fc74a8

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