Malicious PDF — malware analysis report

Static analysis result for SHA-256 f00cd81f29b40895…

MALICIOUS

PDF

92.3 KB Created: 2021-03-13 23:12:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 67dbaba2302c35eda6b740d321b5b16f SHA-1: 391ca9d37389502876d68f55d7cfc53de890cd31 SHA-256: f00cd81f29b408958d0c7235791543d044a8d3798b3515fbefc721722dcec7e6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, indicating it functions as a link farm. The primary purpose appears to be directing users to other PDF documents hosted online, which could be for SEO manipulation or to distribute further malicious content.

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://nipisod.ru/123?utm_term=lightbot+2.+0+answers PDF link annotation
    • http://skout.tech/automatic_control_systems_kuo_10th_editionn8htr.pdfIn PDF document text
    • https://naxozafo.weebly.com/uploads/1/3/1/4/131483391/9dba284b3f5f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374953/normal_5fdc84fe99c10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446036/normal_6017d41b3ad3b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478683/normal_5fc9451fa837d.pdfIn PDF document text
    • https://kefelewupu.weebly.com/uploads/1/3/4/7/134711224/8084600.pdfIn PDF document text
    • http://avlto.best/rufulutowiwusini9fdh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451035/normal_602a2c0ea7d3d.pdfIn PDF document text
    • https://rukinedofixod.weebly.com/uploads/1/3/4/3/134348838/865f9255a5e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492875/normal_5fd789805a499.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/583a07ef-541e-4bd8-b39a-b7c0daf0526c/46684652965.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f749c5b6-011f-475a-b0b9-1e08c597c61d/41392905124.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/85513553725.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/sebaruxa.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/nawibarukozisevafev.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/fapivo.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/toto_sw203401_c100_electronic_bidet_toilet.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/lakamazevatil.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00013b23.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13B23 23304 bytes
SHA-256: 957355c08eea5eb9a5a0464226a1ce6ba4254160f44917fdd0d2d9f70374bc20
font_00_sfnt_off000100e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E2 5396 bytes
SHA-256: 1ec9febe536827fbb6d56af021dd963a063fbbae8daae62066038d7e4f6fda03
font_01_sfnt_off00011350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11350 11544 bytes
SHA-256: b4b21ec30b9d4c57d748b8a813c584643f7be008c34b452194349b0202623aed

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