Malicious PDF — malware analysis report

Static analysis result for SHA-256 e459c088a6560946…

MALICIOUS

PDF

73.8 KB Created: 2021-03-10 04:00:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 51edf470fb1b02c0b6023922f29e372a SHA-1: 956573a82da33c43e5dbe0fe43bac6518eb263c8 SHA-256: e459c088a65609462176e7f4bf57f8de443786bc2a4112b527b72cc6f601d3c6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 0.9998

Heuristics 6

  • 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 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://vilenefex.ru/123?utm_term=sinking+deep+hillsong+piano+sheet+music+free PDF link annotation
    • http://jiwapadenejeza.getenjoyment.net/why_isnt_my_aux_cord_working_in_my_car.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467577/normal_6038c06cc98d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388819/normal_600e85f65c28d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391305/normal_5fe405139aa7d.pdfIn PDF document text
    • http://mizebojusur.mypressonline.com/20875380708.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365649/normal_6014a1880c884.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381347/normal_60159f12003ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484612/normal_5ff199492946d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/guide_build_ezreal_ap.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/85068406002.pdfIn PDF document text
    • https://c9b0c9dc-51ad-46ec-84b2-dbc26df53712.filesusr.com/ugd/b6f588_04cb82c17edc448eabf697c617603604.pdf?index=trueIn PDF document text
    • https://fdb4f28e-c637-431f-967d-457feef73efb.filesusr.com/ugd/cf5aa9_b2eef9dc3d5d4bac8791d0160818af47.pdf?index=trueIn PDF document text
    • https://926da24b-d3df-4aea-ac1b-ebdf7359a9e7.filesusr.com/ugd/fef925_4afca7d85c5e4fb79da99f057e6b43c5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/bozobaduxesetulode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b17fdf30-97df-46c4-a75c-8b735e1e1a86/xigojiruzirawidinogufis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9f3de7d-ac42-4451-8e18-02702d6d154b/48803570231.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

Related samples 6

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42E 5736 bytes
SHA-256: ef0c63ebac88ea77b6da9fda1e89d27e529aa529dee0667e13800a197d5ceb89
font_01_sfnt_off0000f79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79A 10020 bytes
SHA-256: b504c27bfcadb29f54d27ffe3e25c10f5188ef14a90b11a27fac75af782e9d58

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