Malicious PDF — malware analysis report

Static analysis result for SHA-256 b457f33e96b41d18…

MALICIOUS

PDF

81.9 KB Created: 2021-03-31 09:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d78fca384438866aa79436b4526ec747 SHA-1: 061f9a5ff05ba88f46c63df53bb1d05d5ec96d2a SHA-256: b457f33e96b41d18d0bdbd39aa9759f8d0fd31815c8c32169346c0be2a0daf01
126 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a trojan. No scripts were extracted from this sample, but the presence of external URIs and the overall detection profile point towards a malicious document.

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://lozipotod.ru/123?utm_term=mp+b.+ed+online+application+form+2019 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448713/normal_6054175235cb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482218/normal_606055fe4fae0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471250/normal_5fc87764b92b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389805/normal_5fe57de6a2499.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392441/normal_60170160d56a0.pdfIn PDF document text
    • http://gebuhrenfrei-mein.com/minecraft_sweet_and_awesome_jar_downloadardcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384633/normal_5fea2efd48093.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://topcreditscore.info/the_blacker_the_berry_novelbdkw7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_e87c808902e54fd5a785c8ee5bf04017.pdf?index=trueIn PDF document text
    • https://ed36ca5d-e6e9-4caf-8bbb-3a8af5cfee16.filesusr.com/ugd/971556_074fa77f36524197a31aa9a7c78450da.pdf?index=trueIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_edea898eb3074be9a9eb9819d95afd84.pdf?index=trueIn PDF document text
    • https://4a31e3f8-49e3-4331-b1a9-c0bb7a6b9dbc.filesusr.com/ugd/599f1c_8e1fbbba2c514445a046f45c63d3588d.pdf?index=trueIn PDF document text
    • http://roraxekabitapoz.rf.gd/hypertension_guidelines_american_heart_association.pdfIn PDF document text
    • http://mekuroxowu.epizy.com/the_noble_quran_transliteration_in_roman_script_with_arabic_text_and_english_translation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/827ac957-05c5-4888-bf9a-5970e17b8206/is_he_dipole_dipole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c63dd06-6f66-4262-a827-5f067262069e/goxabimulinofemep.pdfIn PDF document text
    • http://dabevejef.rf.gd/geonosian_queen_guide.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_off0000feda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDA 5784 bytes
SHA-256: 8f67f3e6e5181516da8abc5fa010403102f4be7cec7988c770e0d5becda6c825
font_01_sfnt_off00011287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11287 11116 bytes
SHA-256: cae05dc5854314022187923b1706df37cc28e4579e4e209895fabc9baeaa3ead

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