Malicious PDF — malware analysis report

Static analysis result for SHA-256 849e402377c7c4a3…

MALICIOUS

PDF

86.0 KB Created: 2021-03-03 08:47:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 24c9299bada19832f62551b7596caca8 SHA-1: 897b9b0b385ea536e7d01bdd25f81d43102a2d10 SHA-256: 849e402377c7c4a3055fd185cdc5daae95839b6b64d87e029b79fe6718e6ee7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or SEO poisoning tactic. One of the primary external URIs, 'https://fokemale.ru/award?keyword=bias+base+rate+fallacy', indicates a potential lure to a website that may host further malicious content or phishing pages. No scripts were extracted, but the PDF structure and numerous external links strongly suggest it's part of a campaign to drive traffic to malicious sites.

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 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.
  • 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://fokemale.ru/award?keyword=bias+base+rate+fallacy PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4469143/normal_5fc5bdd5acf90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408713/normal_601b1f2818e2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495262/normal_60173913d25a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423452/normal_5ffb3181530e0.pdfIn PDF document text
    • https://ratofesut.weebly.com/uploads/1/3/5/3/135304008/jomuriluxosani.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372086/normal_6000cc7d7dbd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393502/normal_600bc2b3b4960.pdfIn PDF document text
    • https://pekubitox.weebly.com/uploads/1/3/4/4/134477952/biseg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377935/normal_5ffa59696f921.pdfIn PDF document text
    • https://cdn.sqhk.co/kowukogifaw/gegi5MI/ringcentral_meetings_join_from_browser.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465924/normal_6025e56831db1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383321/normal_602a80c1175cb.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/divelatoxa/vesexofomexolid.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE71 5168 bytes
SHA-256: c0c8b61426808eb823578413f77da843881357b7d27d69dc26d90e81b870e443
font_01_sfnt_off0001101c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101C 11276 bytes
SHA-256: 29dedf315fdaa724c33505a9bb3bbc72fccccac1f790056696508c05a8f9c050
font_02_sfnt_off0001369c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1369C 16060 bytes
SHA-256: fe9571d28fae7a61d971a76d6a96357abdaf1bd28a19be60b9745fe6aa3ab5b8

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