Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0bc9b24ba42af72…

MALICIOUS

PDF

55.3 KB Created: 2020-11-08 22:40:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: eb1b8ed45fb44d98284cc5d3c76f398d SHA-1: 9d25ce515e9bbd6857101b1a244a6db642379a75 SHA-256: d0bc9b24ba42af7208de1ca94916892078df6dcd67437b9af54ade07bdd42821
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://trafficel.ru/123?keyword=college+algebra+by+sullivan+10th+edition+pdf PDF link annotation
    • https://kopezemab.weebly.com/uploads/1/3/4/3/134339977/nelun.pdfIn PDF document text
    • https://zonerizarom.weebly.com/uploads/1/3/4/3/134310007/7073654.pdfIn PDF document text
    • https://dilukali.weebly.com/uploads/1/3/4/5/134584555/noxediziwarokid.pdfIn PDF document text
    • https://jeponiruwapin.weebly.com/uploads/1/3/0/7/130776483/636781.pdfIn PDF document text
    • https://kiroteveve.weebly.com/uploads/1/3/4/3/134378898/d1f747f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368250/normal_5f880cd918502.pdfIn PDF document text
    • https://wepoduxusuduxi.weebly.com/uploads/1/3/4/3/134306179/5062018.pdfIn PDF document text
    • https://segawerod.weebly.com/uploads/1/3/4/3/134313685/kojane.pdfIn PDF document text
    • https://nifudosuv.weebly.com/uploads/1/3/4/0/134040563/tasudobefituz-jaregofi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462037/normal_5fa6e78b04e1a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://zukujizaleli.files.wordpress.com/2020/11/sufujefavu.pdfIn PDF document text
    • https://nuzobelesuli.files.wordpress.com/2020/11/41183637013.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/serge_ibaka_contract_extension.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/afinidades_eletivas.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C2D 5704 bytes
SHA-256: cfc24359338ba43247e77d4ee452ff6f7f76e2cbd72dc17a9fa4b0a6ed8ec845
font_01_sfnt_off00008f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F9E 3720 bytes
SHA-256: d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281
font_02_sfnt_off00009b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B02 11348 bytes
SHA-256: 73e3fe17816b6f6b05f07ad0964626b0f26f355c5a2591970a15c16185c83f94
font_03_sfnt_off0000c12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC12A 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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