Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9dd7e2c179a5735…

MALICIOUS

PDF

72.3 KB Created: 2021-06-04 22:40:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 03e2d49ced6c6031bc23ca597a5b69f8 SHA-1: 4b0413c61055732c960f7a53b7a2f00234968b44 SHA-256: d9dd7e2c179a5735e7af15fed87cb6a32a937e3e331b25017eba4151e2d3d8dc
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 multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF contains numerous embedded URLs that point to a link farm, suggesting it is used to redirect users to potentially malicious content or phishing sites. The presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution 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://crewmak.ru/pbw?utm_term=calvary+chapel+christian+school+las+vegas+reviews PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427811/normal_60367dd07eef9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475737/normal_5ffffd88be018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486772/normal_60186408f022c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369168/normal_606a264f237f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404285/normal_6047cafeabee0.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4490377/normal_60b6cafd4c1df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467581/normal_603e15df1d14f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416316/normal_6041296315e2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475379/normal_602409fdcd817.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415046/normal_5fd6649f84114.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406170/normal_606505526f4aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492574/normal_5fe0cdb938831.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lesokulovisu.pbworks.com/f/71903806141.pdfIn PDF document text
    • http://pidexuxok.pbworks.com/w/file/fetch/144581343/vogus.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/w/file/fetch/144582945/835568530.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99102658-a1cb-4b55-ad19-8f4b4234fb77/selowisizalofe.pdfIn PDF document text
    • http://fufitan.pbworks.com/w/file/fetch/144553707/operations_management_by_william_j._stevenson_13th_edition_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b84d0ac-0a6d-4856-bf86-28df9af6282f/ferisugitebewek.pdfIn PDF document text
    • http://xalanupuzewo.pbworks.com/w/file/fetch/144411720/jiboxipaluvepafanuripog.pdfIn PDF document text
    • http://wusagem.pbworks.com/w/file/fetch/144470736/gekidifewesunufena.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_off0000daf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF9 5356 bytes
SHA-256: 57b8a9f8f77a49c02c1f16f4722fa065205ff58d537c3aa077a1eaf16a17f899
font_01_sfnt_off0000ed41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED41 10600 bytes
SHA-256: d9162b9b43f3e4fa1ef4bc5090eeda5f7b6843b7626533a6d880782ad439386a

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