Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5b0bb89b2064e4…

MALICIOUS

PDF

88.6 KB Created: 2021-06-13 04:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: aea2d507a45bf47d3fa80f2fe0e2e23b SHA-1: b6da2b2a94195b4c269a8d3495747193750bb5ed SHA-256: 8a5b0bb89b2064e4ce3f231a58881ee96348ec2a38e5b6f71aaa2d0acc895a09
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicating a link farm designed for SEO manipulation. The presence of a download button lure and the ML classifier's high confidence score suggest malicious intent, likely to redirect users to malicious sites or download further payloads. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or content-luring campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelibifir.ru/123?utm_term=abcd+2+full+movie++480p+free PDF link annotation
    • https://sogazefod.weebly.com/uploads/1/3/4/0/134000298/9d4a8efefe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379473/normal_6053b68aa64c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493245/normal_604137d6c1ee5.pdfIn PDF document text
    • https://sezokifor.weebly.com/uploads/1/3/4/5/134596047/tinefajorof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409257/normal_60be006257e9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407066/normal_5fe34258a0fc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445888/normal_606a32baeebd8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382192/normal_5ff605607e836.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485939/normal_5fec284b8b91a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409827/normal_60611d5e4cace.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486552/normal_60261ad1bc06b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405652/normal_605bdca141443.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407664/normal_60274d846cec1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379851/normal_5ff7a76c6b181.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.orgThisIn PDF document text
    • http://www.fontrix.comhttp://www.nhncorp.comIn PDF document text
    • http://gonikob.pbworks.com/f/simple_pl_and_balance_sheet_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46b8476b-a0f7-43ee-995d-dcedcbed4d20/craftsman_electric_chainsaw_chain_replacement.pdfIn PDF document text
    • http://jujirafamena.pbworks.com/f/xibefesobafupigumifuvok.pdfIn PDF document text
    • http://kipizasuzeda.pbworks.com/w/file/fetch/144718758/tamururi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b8febf0-8192-4d17-afe6-d647be4e0606/19401518001.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ae41390-39e8-4d0d-8733-0ec1a44e5214/zitoti.pdfIn PDF document text
    • http://gegoxelaw.pbworks.com/f/toregapu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4413dd3-00c0-4cb6-b02b-1ffe3dbc1817/pefaxotibufuvikul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be5ed44d-7b32-4c07-b208-aceb0616ff91/what_is_a_peoplesoft_id_uh.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
    • http://scripts.sil.org/In PDF document text
    • http://scripts.sil.org/OFLAbyssinicaIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04A 5656 bytes
SHA-256: 32501a17745eb6df3d7a6ed9e719f21199d788ef6f50e6a9141e3ed2f4002f0b
font_01_sfnt_off0001038b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038B 20968 bytes
SHA-256: 87985804ebf98b1030980f20b4e39595e1aa76caccafc3e7d64f2ca02509db1c
font_02_sfnt_off000123c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C1 11104 bytes
SHA-256: 76692ace571d6c62b2b0d891bc230f0acaf6fcaac1e282794e213fe979bae695
font_03_sfnt_off000149d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149D7 2056 bytes
SHA-256: e5f30af547b55dfbbae63869c45e93d04e829a64999393572a2275da8290585e

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