Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c7b508a52fa2772…

MALICIOUS

PDF

72.5 KB Created: 2021-04-02 00:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 131ec409614998b3111f8571a778847f SHA-1: b04d0ada86080b2e096afdfb70250c05020f9163 SHA-256: 0c7b508a52fa27724c51aae7b7b4a5f1ba8d1e1be26a3c2911ef96d07df91b06
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 external URIs, with one prominent URL pointing to a domain associated with phishing tactics. The document body, though heavily obfuscated, suggests a lure related to 'Docker image from private registry', likely to entice users to click on the malicious links.

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://jumiwimov.ru/123?utm_term=docker++image+from+private+registry PDF link annotation
    • http://gasurorir.sportsontheweb.net/tratamento_da_anemia.pdfIn PDF document text
    • http://kinemulawaw.sportsontheweb.net/ethyl_acetate_msds.pdfIn PDF document text
    • http://rajeziriga.scienceontheweb.net/vagemojisawexow.pdfIn PDF document text
    • http://remebetegekit.iblogger.org/tcs_fresco_play_questions_and_answers.pdfIn PDF document text
    • http://nuxipawuxodiwa.getenjoyment.net/altium_designer_pcb_tutorial.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371014/normal_605f3ac25e736.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371269/normal_60362ba43f529.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://masemipeba.myartsonline.com/molecular_heterogeneous_catalysis.pdfIn PDF document text
    • http://jozazesebogole.rf.gd/hokkaido_university_map.pdfIn PDF document text
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_6a1c8d9a2fa34b51bec543041f28695f.pdf?index=trueIn PDF document text
    • https://318abaa7-a496-4882-a5ef-186b1d719b20.filesusr.com/ugd/ff2e65_4bd2c6ed568840bb89d7e76b463889d7.pdf?index=trueIn PDF document text
    • http://ledufowi.myartsonline.com/wixenuf.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/piriformis_muscle_stretch_yoga.pdfIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_af9ea171c0e94963bea5984ce96d08fc.pdf?index=trueIn 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_off0000dc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC58 5528 bytes
SHA-256: 810475b54804790996f798011ddb1d72ce3e25a348422e19908b5fb913b5ad3d
font_01_sfnt_off0000ef30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF30 11148 bytes
SHA-256: 5d2807f74ead50903b9710e2be8828ceade560267ab57cc461d9c5232c7e8c87

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