Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c1761ffee0f0f7…

MALICIOUS

PDF

85.6 KB Created: 2021-04-07 06:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f60bebcc1d320924680d99291d2acd38 SHA-1: 6a4a6e549383d61fd37c07aabc114541a3567294 SHA-256: f4c1761ffee0f0f722c4f553cb879314fb0a90b1892640dd926e50160c73353e
126 Risk Score

Malware Insights

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

This PDF document is classified as malicious, with a high confidence score from ML and ClamAV detections. It contains multiple external URIs, including one that appears to be a lure for a business guide, likely intended to redirect users to a phishing or malware site. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for link farms, further suggesting malicious intent. No scripts were extracted, but the presence of embedded URLs and the overall structure point towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://soxebez.ru/award?keyword=how+to+start+a+business+without+money+pdf PDF link annotation
    • http://tamakar.xyz/32369075701i4q6f.pdfIn PDF document text
    • http://tepoparupomo.medianewsonline.com/kickboxing_workout_routine.pdfIn PDF document text
    • https://xuzimelo.weebly.com/uploads/1/3/4/1/134132070/a48492.pdfIn PDF document text
    • https://bopunesarikimar.weebly.com/uploads/1/3/1/4/131453984/tuzom.pdfIn PDF document text
    • https://vetudibe.weebly.com/uploads/1/3/5/3/135320479/rutitobaxemawuw.pdfIn PDF document text
    • http://lnstagramlivesupportcenter.com/5542862060009u4a.pdfIn PDF document text
    • http://laketofetujeso.medianewsonline.com/nipivozem.pdfIn PDF document text
    • http://1xbet-regi.site/42531257112cbe2s.pdfIn PDF document text
    • http://svoytrylend.xyz/14741922010p0ya5.pdfIn PDF document text
    • http://zujirekirel.22web.org/witun.pdfIn PDF document text
    • http://aromaita.space/68619607499kavoc.pdfIn PDF document text
    • https://sivitudogadix.weebly.com/uploads/1/3/4/1/134108631/2901be76819d.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://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_898c8f7e354c4f0da389f9dcdedfe41e.pdf?index=trueIn PDF document text
    • https://2c8134a4-d865-4da1-8961-c755d7242105.filesusr.com/ugd/6dcf04_d6010625496e4ae69d8e5dba014382a1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pegebunov/risuvamebul.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/engineering_piping_design_guide.pdfIn PDF document text
    • http://xirebegutuvu.rf.gd/amantele_trecutului_download.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA43 5428 bytes
SHA-256: 13641e51260f90d0aa9f388d1fde7030e2bb71ead9c4377adcfdff0b44b560b2
font_01_sfnt_off0000fc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC92 11432 bytes
SHA-256: c3dfab5705a7784bf52da1a0a26e1de16d0a4d932be0d52e7bb2839305abd5dd
font_02_sfnt_off00012387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12387 16344 bytes
SHA-256: ed45a24507f18daeaf6b6e9cac20235e9e43bed88bc2d44b7621eff085e31190
font_03_sfnt_off000138ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138FF 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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