Malicious PDF — malware analysis report

Static analysis result for SHA-256 8703bd0451a2d3af…

MALICIOUS

PDF

73.5 KB Created: 2021-06-06 08:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ebcc7b08b010a056a1930e891ec472fa SHA-1: cc36a47eeb1b94c91f7c6c9be2f01e2a70e14dd6 SHA-256: 8703bd0451a2d3af5e933d011a2ce8760dac17603a458ce7591d5de3620167c7
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

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://synerhu.ru/pbw?utm_term=derek+prince+teaching+letters+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451374/normal_604efba40da19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416798/normal_5fe4d2fd7195d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486199/normal_5ff306de37aa5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421061/normal_5fd14a5a242c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374953/normal_6013149f5be94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490920/normal_604e5eeff16d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488090/normal_5ff0c0a9640b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448113/normal_60637c76d0b3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409114/normal_5fc5952258a32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446645/normal_6002487535fbe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mizunebapod.pbworks.com/w/file/fetch/144466593/32068815770.pdfIn PDF document text
    • http://botinuba.pbworks.com/w/file/fetch/144414741/82552019893.pdfIn PDF document text
    • http://kevuxezedila.pbworks.com/w/file/fetch/144606090/tere_bin_nahi_jeena_mar_jana_dholna_song_ringtone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75e04bc5-cb82-4743-9111-f5ecbaafed5d/problemas_de_repartos_proporcionales_3_eso.pdfIn PDF document text
    • http://tasonupopam.pbworks.com/w/file/fetch/144505947/63351730424.pdfIn PDF document text
    • http://kedefoviraj.pbworks.com/f/8676848912.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9461a8e-d1c6-4c59-a0bb-8ea0de78c27a/92110281120.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/772da46a-b283-4473-97b3-252f4efba7a6/30779777807.pdfIn PDF document text
    • http://vakerul.pbworks.com/w/file/fetch/144511857/35443978158.pdfIn PDF document text
    • http://wiwedano.pbworks.com/f/pisisavufesubisi.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_off0000e0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EC 5480 bytes
SHA-256: d97f3f40d6748373becc9b0f6ae62db8065f34552d6e9b168ae6aa6ce6f5b8fe
font_01_sfnt_off0000f392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF392 10752 bytes
SHA-256: 29bb49195bf1497052ae321eb4ac48ba61b4690d266c362eb3ef1f1b88aaa93e

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