Malicious PDF — malware analysis report

Static analysis result for SHA-256 93283b1631e29d7b…

MALICIOUS

PDF

81.4 KB Created: 2021-05-02 01:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e6dfee7db3528b09240f60e0965d5805 SHA-1: da0b2ddb37575cdbe339560062dfcf743c4e419a SHA-256: 93283b1631e29d7b185126bc2a72e8734be98e4348e2a37ccd27f8e92b7aac94
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 0.9994

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://kuzutuzo.ru/strik?utm_term=fitbit+charge+hr+not+charging+or+turning+on PDF link annotation
    • http://muzibatixabu.mypressonline.com/korobufokipe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464297/normal_60087d4cd7e4f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411491/normal_5ffe1a0e3ee85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485448/normal_6035fe998e737.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474223/normal_5fd2637e26f16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478146/normal_605c688915e71.pdfIn PDF document text
    • http://gatofupimekow.mywebcommunity.org/45946019475.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409811/normal_60188a9245815.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403948/normal_6034fb7ccc5bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383446/normal_5feb940f7a9b3.pdfIn PDF document text
    • https://simisasokudu.weebly.com/uploads/1/3/4/2/134235492/xugudowebutoz.pdfIn PDF document text
    • https://defugelunek.weebly.com/uploads/1/3/4/5/134524545/mepup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368230/normal_600040eb5bce4.pdfIn PDF document text
    • http://kejoxemubogese.mywebcommunity.org/wulorofinuvezununibi.pdfIn PDF document text
    • https://xolijusir.weebly.com/uploads/1/3/4/0/134016651/bunizavibimimaz_kimemetifok_xuxekikaxilono_wizevadoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421780/normal_5fdb7bc9f12e8.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/womirofop/19305087766.pdfIn PDF document text
    • https://s3.amazonaws.com/siwixomudit/92832288867.pdfIn PDF document text
    • http://xazopufegi.onlinewebshop.net/vubukisifu.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/iko_linear_guide_malaysia.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/power_air_fryer_review_consumer_reports.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edc488a1-61fd-4b76-afbc-be1d288cbc04/35771531761.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52e39328-c73f-44fd-a330-8f2d84410062/71733550808.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCA 4948 bytes
SHA-256: 942336cef997f248106b31d5f66972977b033619a5231cb5401a0787bb76cf16
font_01_sfnt_off0001109d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109D 11100 bytes
SHA-256: e86d1007fcacb67719c8b048e8bebc1b59d88a0c7fe95f689c0ceeb2b3ab4d47

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