Malicious PDF — malware analysis report

Static analysis result for SHA-256 f69c7755f3f88200…

MALICIOUS

PDF

77.6 KB Created: 2020-12-17 23:30:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1b0bd4a128cd593907f1cacfe3608f66 SHA-1: 1bd0e4255783eff8b8aaab8ff410dc4a0c98f73b SHA-256: f69c7755f3f88200009aa9f5dfb4aa36500a1bf3d6dd88105824b53b5f43e729
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 0.9999

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://trafffe.ru/123?utm_term=raidmax+smilodon+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4414689/normal_5fca29747272e.pdfIn PDF document text
    • https://goraworozegisu.weebly.com/uploads/1/3/4/3/134324811/9801963.pdfIn PDF document text
    • https://bevibobozile.weebly.com/uploads/1/3/4/7/134700853/8479111.pdfIn PDF document text
    • https://satotujum.weebly.com/uploads/1/3/4/3/134308249/318332.pdfIn PDF document text
    • https://basotode.weebly.com/uploads/1/3/4/6/134691624/gapiwelarigafosive.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380213/normal_5f8eb1b0249f2.pdfIn PDF document text
    • https://fugokepak.weebly.com/uploads/1/3/4/8/134856046/1356288.pdfIn PDF document text
    • https://kedixezowudogaj.weebly.com/uploads/1/3/4/6/134618790/1ed3fd7b6f50.pdfIn PDF document text
    • https://bizevino.weebly.com/uploads/1/3/4/3/134320064/visax-rogadomogodav-fatikomolufujop-redel.pdfIn PDF document text
    • https://lupexepiw.weebly.com/uploads/1/3/4/3/134318885/xutezusumagula_kizubigesuna.pdfIn PDF document text
    • https://jatilesaza.weebly.com/uploads/1/3/4/3/134316516/ac8412439aaa0d8.pdfIn PDF document text
    • https://mojoranazo.weebly.com/uploads/1/3/4/4/134403481/vamozaruvi_rewiki_dewokelez_tuvos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57C 4952 bytes
SHA-256: cef0ff5b6bd80abe20b0747d2462f99435769ac7a1fcba0a9c14e9bcab8cfcaa
font_01_sfnt_off0001064c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064C 10740 bytes
SHA-256: f676453ee36c7e89dfc5c8ac5c967fbfb26ec14199f5a476960d375e3d57de0f

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