Malicious PDF — malware analysis report

Static analysis result for SHA-256 2500aae719cea946…

MALICIOUS

PDF

75.5 KB Created: 2021-02-12 00:32:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fc69a5b456bda5da82abc04d559fc9ba SHA-1: d0759947ff5278777282c0979ea698dc3da8cceb SHA-256: 2500aae719cea946cf552709ce0918f18bb49b2a4cc39778e954b7d145825d48
226 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. It uses a password-protected-archive lure. 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 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://maypoin.ru/123?utm_term=asus+laptop+factory+reset+not+working PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485322/normal_6017164a74650.pdfIn PDF document text
    • https://tadeliganunuzax.weebly.com/uploads/1/3/0/9/130969808/8430591.pdfIn PDF document text
    • https://jinobodusere.weebly.com/uploads/1/3/4/7/134722577/3279633.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448332/normal_5fe10346bde15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418567/normal_5fd644ccbbfa6.pdfIn PDF document text
    • http://bluebadgeapproval.com/163371547571gpu1.pdfIn PDF document text
    • http://shoop-fh.ru/crickets_meme_sound_effect_downloadbw1dn.pdfIn PDF document text
    • http://5gusevshop.space/145968800080b2cm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500444/normal_601002991f281.pdfIn PDF document text
    • https://nujetamewude.weebly.com/uploads/1/3/4/8/134881912/3995220.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500183/normal_5fd68ab7643e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413017/normal_5fdcd134586b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450038/normal_601b74a4be6ad.pdfIn PDF document text
    • https://lomameleni.weebly.com/uploads/1/3/4/5/134597964/vegit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484997/normal_600f41a9bd281.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
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC4 5312 bytes
SHA-256: b3f1a1be932a7e6bafb5a95902b41a90c80b42e09f27296bf3020825b13aa65f
font_01_sfnt_off0000ef08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF08 10352 bytes
SHA-256: 96477cfe2689018cc05957364029c761e9b3405a06da56c37242fef8934dee5c
font_02_sfnt_off00011275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11275 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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