Malicious PDF — malware analysis report

Static analysis result for SHA-256 838b2afa7d82766c…

MALICIOUS

PDF

81.5 KB Created: 2021-03-29 01:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 12676fb075c0fcc5d8948e73118a43c8 SHA-1: 1fed6b52d2128d3a483535b703d5788b3e4935f6 SHA-256: 838b2afa7d82766c0ba4d97da337900ab85c5f2964cd60c1f672b47d89eab140
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://midufefew.ru/123?utm_term=arizona+coues+deer+hunting+guides PDF link annotation
    • https://cdn.sqhk.co/risubibasero/gglHAhi/24442734182.pdfIn PDF document text
    • http://kakafeg.scienceontheweb.net/26951030368.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410702/normal_5fc9beac5f198.pdfIn PDF document text
    • http://lajafago.medianewsonline.com/jpg_to_converter.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444104/normal_601fbf4452f17.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444655/normal_5ffd660e7932b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410030/normal_5fe95d3a2b083.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366952/normal_6000dc6fe2539.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451752/normal_5ff1bcd931e5a.pdfIn PDF document text
    • https://cdn.sqhk.co/fowifabibu/ieq8gfY/high_speed_pinball_machine_price.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492240/normal_6044dcbdc1ca9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379387/normal_601e0e941894e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483083/normal_6019b4ecd65cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450624/normal_6047c44530f59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370263/normal_604d271701872.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403539/normal_604f3e62d8675.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_7df825b700c949c49dbcbba4e97f002b.pdf?index=trueIn PDF document text
    • https://a001dc82-f31e-4944-9b76-0a8e602b6855.filesusr.com/ugd/e4ee87_633d32c862954d0e88e593095411712a.pdf?index=trueIn PDF document text
    • https://5f90d536-2a72-4461-adff-280afd3056cb.filesusr.com/ugd/27c394_707f99d0311e4e46b35e12e627c5ca0a.pdf?index=trueIn 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_off00010070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10070 5208 bytes
SHA-256: 9f576ebf660b5d8df40a32b0f6e6507ed4b671a0dbcd90d9149f80281f9266b7
font_01_sfnt_off00011227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11227 11360 bytes
SHA-256: d2b3e4ae4fd2aa3e6089da18d07d5b30cb0afe71d923aab1b1b56f24462fcf86

Open this report in the interactive analyzer, or submit your own file for analysis.