Malicious PDF — malware analysis report

Static analysis result for SHA-256 7377b82d2a3b6418…

MALICIOUS

PDF

81.6 KB Created: 2021-03-16 10:09:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: cd69354c5fa5d57857bfa4aed2b03d6b SHA-1: 41edcc3421ea094804eebdb8bae2a94c79e47105 SHA-256: 7377b82d2a3b6418411c121ee61b8aef24064d174b203186a9a0520342e6f6b4
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. It contains numerous embedded URIs, with one notable example being https://bologen.ru/123?utm_term=year+3+maths+worksheets+addition+and+subtraction, suggesting a phishing or malware distribution attempt. The presence of external links and the overall detection profile strongly indicate a malicious intent, likely related to phishing lures.

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://bologen.ru/123?utm_term=year+3+maths+worksheets+addition+and+subtraction PDF link annotation
    • http://xinuvaro.sportsontheweb.net/syma_s107h_remote_control_helicopter.pdfIn PDF document text
    • http://jakesubinosol.scienceontheweb.net/20116587806.pdfIn PDF document text
    • http://potolkilife.ru/chrysler_sebring_2006_repair_manualwwv2u.pdfIn PDF document text
    • http://veronaital.space/bafiduwufaxaxuzinuvarofowv4.pdfIn PDF document text
    • http://kutegexuwudaro.getenjoyment.net/convert_to_word_big_file_free.pdfIn PDF document text
    • http://opensoda.pro/sudabom52iuu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375200/normal_5ff7ea4fe9d7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493917/normal_60242883dd23c.pdfIn PDF document text
    • http://italysummer.space/79230850210hyk6h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ce322291-b3da-4cc2-ae0f-523e25daec44.filesusr.com/ugd/4530da_188bc62f3e654846b3f9dbaa2084f14a.pdf?index=trueIn PDF document text
    • http://xolavozezimodan.onlinewebshop.net/vespa_px_125_manual.pdfIn PDF document text
    • http://xifimerin.onlinewebshop.net/42089563662.pdfIn PDF document text
    • https://f72e0e13-a873-49c5-9cb5-3c2848b8c5b2.filesusr.com/ugd/f8ba4b_0c62a03349ba49adacfaa16c8bdf97d7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/abab8a39-a217-49f6-a1f8-97b34166ce0e/walmart_pharmacy_phone_number_menomonie.pdfIn PDF document text
    • https://3064a0a7-8496-4b95-be1e-56094aee372f.filesusr.com/ugd/0cf4b9_75079e9d22e742a1a1db9efde05ae8ae.pdf?index=trueIn PDF document text
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_d3cad6c506924bdc97eb62da78f10b2c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/844dda78-b57e-437a-bd9a-94d5193d665f/disney_cast_member_discount_halloween_party.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_off00010029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10029 5568 bytes
SHA-256: 7d3ea3cacabfc4af23cd2081958f6a7fc78395836bde1393819af699bb16dcaa
font_01_sfnt_off000112fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FD 11084 bytes
SHA-256: 9a54418cec3128a4e2c5dac1d73b468d0ae8e2707a65761db445cf0148403c65

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