Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d42dd1af89a8a16…

MALICIOUS

PDF

78.4 KB Created: 2021-04-02 17:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9792edd53a10b309d26e582a08fe2e2 SHA-1: 7eabb69dc8886914a6b53119181f3a9585e5a064 SHA-256: 0d42dd1af89a8a168296a0108f3b44f9352f2b5cf2d65945f333ee01cc78392e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain associated with phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports a malicious campaign.

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://vilenefex.ru/aws?utm_term=m+audio+keystation+pro+88
    • http://zanovekolasin.mywebcommunity.org/sql_injection_tutorial_download.pdf
    • http://wimesuzajomos.mypressonline.com/81589668937.pdf
    • http://wusejopajaxus.22web.org/aiag_core_tools_manuals.pdf
    • http://bukuminuwakub.mypressonline.com/30891276685.pdf
    • http://gatofupimekow.mywebcommunity.org/dometic_brisk_air_2_heat_strip_installation.pdf
    • http://jerimujolegem.medianewsonline.com/shl_inductive_reasoning_test.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gowofar.rf.gd/74408797449.pdf
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_28657a178b2945b5ac70637f16667dba.pdf?index=true
    • https://a97be2a3-bfb5-42de-bba9-b145341b31aa.filesusr.com/ugd/1f2860_a98d7e974fbb4c2681fc0d4664577656.pdf?index=true
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_1645f677a16442b4b9f0db7313c4451c.pdf?index=true
    • http://diwavubodinaroj.myartsonline.com/1826305894.pdf
    • https://uploads.strikinglycdn.com/files/c390c7c7-bfe0-431f-912e-184b5d8470f6/vocabulary_workshop_level_c_full_book.pdf
    • https://s3.amazonaws.com/xeropizuwe/ce_approved_full_form.pdf
    • https://uploads.strikinglycdn.com/files/25b515e1-a3d4-4685-a261-dfecd0b70ad6/bionic_gear_bag_tutorial.pdf
    • https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_92bd839849a345fc9654c5b24c68a70b.pdf?index=true
    • https://s3.amazonaws.com/rotowan/chrome_app_for_android_mobile.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_off0000f38f.bin
5575c68cfbc6bf78e174027e4a9cbfdcb7d257dd18a8b4e0e6ff14e9ac2b2282		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF38F 5288 bytes
font_01_sfnt_off000105b1.bin
fe830996a02f87206f4c5990ed966e60e7ed3a78e0aa465107f7e0d13af13e15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105B1 11772 bytes

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