Malicious PDF — malware analysis report

Static analysis result for SHA-256 df5c8d9a4deaabce…

MALICIOUS

PDF

79.3 KB Created: 2021-06-06 17:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 260d79b62cf5810a6918190c42e4effc SHA-1: 72eeafb50bf542e5b868de2802a73bcbcb54201d SHA-256: df5c8d9a4deaabce8656e4a62b049a732381d5c87d89d22359ae264dce126569
186 Risk Score

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 0.9997

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://drafthe.ru/pbw?utm_term=how+to+unlock+luxpro+psp511+thermostat PDF link annotation
    • https://megafibi.weebly.com/uploads/1/3/4/3/134347288/zitezoguta-xifin-tiperenudo.pdfIn PDF document text
    • https://wubomedigupuda.weebly.com/uploads/1/3/4/6/134696881/zewomawivu_pofinawiko_zudekoposogow_fotekixixoxexag.pdfIn PDF document text
    • https://vesepuzimimewij.weebly.com/uploads/1/3/0/7/130776402/fibijuvunogenuxinemo.pdfIn PDF document text
    • https://jalamipitifem.weebly.com/uploads/1/3/0/7/130738892/nimurubapiwen-garavitoserotag-xupubujiw-gujunalopisetav.pdfIn PDF document text
    • https://tajagarajoj.weebly.com/uploads/1/3/0/7/130776182/laxop.pdfIn PDF document text
    • https://kepigepejabuji.weebly.com/uploads/1/3/4/3/134315220/legogutovuz-joxosapovadil-tiputuwi-kusibi.pdfIn PDF document text
    • https://wotapidedodibi.weebly.com/uploads/1/3/4/4/134475573/ketogo.pdfIn PDF document text
    • https://waxuzimad.weebly.com/uploads/1/3/4/8/134852209/fec3481.pdfIn PDF document text
    • https://nuviwusu.weebly.com/uploads/1/3/4/4/134486429/wixenupapinozobaka.pdfIn PDF document text
    • https://gomabimasukefop.weebly.com/uploads/1/3/4/4/134491899/walawulipolonov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sozakuvepar.pbworks.com/f/how_do_you_calculate_subcooling_410a.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/w/file/fetch/144412134/99793606974.pdfIn PDF document text
    • http://sekodegaxex.pbworks.com/f/harry_potter_and_the_goblet_of_fire_stream_reddit.pdfIn PDF document text
    • http://kolasotosexu.pbworks.com/f/sipigafe.pdfIn PDF document text
    • http://piwomimagito.pbworks.com/f/how_to_reset_kenwood.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9d055cc-5be5-4782-b2c2-1bb3969cc13f/76472012011.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54f9d106-7f19-403c-a3f8-8a398d6e64f6/movuvewir.pdfIn PDF document text
    • http://sozevupegufi.pbworks.com/w/file/fetch/144604146/77671790309.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c77ceb7-c479-4258-b644-2ce59d7bddd7/xabuvefotatesilofatuvoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7873a270-30a0-4016-b5e4-24cc32231be8/dimarimedemimizuza.pdfIn PDF document text
    • http://ruxafonan.pbworks.com/f/98530225919.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_off0000f632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF632 5532 bytes
SHA-256: 1009775287ea78fe5adf912d04345c1679ca2df73667a2b526eceda6b4b07de3
font_01_sfnt_off000108f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F4 11500 bytes
SHA-256: e65f6289b69f8348350b6d548b4f0088a26d259209c120aa26d5498c9f37e5c4