Malicious PDF — malware analysis report

Static analysis result for SHA-256 8549cdbcba0c805a…

MALICIOUS

PDF

66.4 KB Created: 2020-11-12 21:59:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 0da4b5c636dd836875eec0797fbed04c SHA-1: d28e872125ce8343bbccc1ff16c027cfe3125b78 SHA-256: 8549cdbcba0c805a0a5943eff7a478a522085bd0e2f8ceb9d6de36dc5194770e
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 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 0.9997

Heuristics 5

  • 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 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://traffking.ru/123?utm_term=digital+lux+meter+lx1010b PDF link annotation
    • https://mekukirofex.weebly.com/uploads/1/3/4/5/134589797/8727802.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375351/normal_5f8a506d7c18a.pdfIn PDF document text
    • https://tokuguzeg.weebly.com/uploads/1/3/4/4/134464653/ladifibafu-kenubo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381321/normal_5fa726849c6a3.pdfIn PDF document text
    • https://perixezekawuxod.weebly.com/uploads/1/3/4/5/134504143/gezifalemo.pdfIn PDF document text
    • https://naxesitigas.weebly.com/uploads/1/3/0/7/130740165/kegowi.pdfIn PDF document text
    • https://lozugukavokukes.weebly.com/uploads/1/3/4/3/134357100/vazudeti.pdfIn PDF document text
    • https://jixatazibasuv.weebly.com/uploads/1/3/4/4/134402985/5a99bd81b.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://uploads.strikinglycdn.com/files/7b623415-f1ca-422e-85f5-226da53bb274/5893723769.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3b7c8c7-37e6-4bf3-82ac-eaac2961f691/deluxe_how_luxury_lost_its_luster_dana_thomas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62e92a65-c986-4e95-9a9f-645170e1eef5/26592559456.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a53084ea-b03f-4645-a93f-e41e4a37b2da/free_rp_diet_menu.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E8 4896 bytes
SHA-256: 71571cbaa714ed0704e28b2aee1112ce0d8fc6eac71fe9c9cee345d204682ad7
font_01_sfnt_off0000c8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A4 11192 bytes
SHA-256: d816067cd8085949bebc7786fb4e1dbff33ed76057f278578d916e983470b2c6
font_02_sfnt_off0000eecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECF 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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