Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f99d8110aacbf96…

MALICIOUS

PDF

119.9 KB Created: 2021-04-27 07:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 336d6450d43f7d33188cc153f794e6ea SHA-1: 9777f50e9b27575466abec60ec32743605377c4e SHA-256: 3f99d8110aacbf96c2d05ca94f7bdea4fa5c26f22caeb5c8f08001c25ffd79dc
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment designed to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dafemum.ru/strik?utm_term=what+does+12+mean+in+betting PDF link annotation
    • https://vujipobunovopo.weebly.com/uploads/1/3/5/3/135324227/11bc33ce2ac803.pdfIn PDF document text
    • https://suxokigivulumu.weebly.com/uploads/1/3/4/4/134479742/22e15.pdfIn PDF document text
    • https://xudorelaguf.weebly.com/uploads/1/3/0/8/130813521/kuwupek.pdfIn PDF document text
    • http://feyakast.online/nanavonumera1w9e.pdfIn PDF document text
    • https://jadufebifov.weebly.com/uploads/1/3/4/6/134627690/4472459.pdfIn PDF document text
    • https://wefogazasu.weebly.com/uploads/1/3/4/8/134880183/diguxeruvemaxe.pdfIn PDF document text
    • https://fozipomeripimak.weebly.com/uploads/1/3/4/6/134610298/4496263.pdfIn PDF document text
    • https://xurekibovadava.weebly.com/uploads/1/3/0/9/130969225/ripofofigemadonoziro.pdfIn PDF document text
    • https://jumifusat.weebly.com/uploads/1/3/4/6/134629025/luzela.pdfIn PDF document text
    • https://fepobiwebefu.weebly.com/uploads/1/3/4/5/134592484/depepiluxeru_pimabalute.pdfIn PDF document text
    • http://yatvoyya.fun/45565582940g4axd.pdfIn PDF document text
    • https://devojakosumu.weebly.com/uploads/1/3/5/3/135314674/zotisesefa_sotamipenon_legogogoren_posel.pdfIn PDF document text
    • https://womegirig.weebly.com/uploads/1/3/4/5/134506381/664efe4f.pdfIn PDF document text
    • http://geekcods.com/xiwivusugapujojudiruximwb604.pdfIn PDF document text
    • http://titanovyi-filtr.ru/writing_research_papers_a_complete_guide_14th_edition1jmxl.pdfIn PDF document text
    • https://sozivutapadonen.weebly.com/uploads/1/3/1/1/131164462/864537.pdfIn PDF document text
    • https://pevusipifo.weebly.com/uploads/1/3/4/8/134863194/walegod_govulojavumediw.pdfIn PDF document text
    • https://dudixugodibemuf.weebly.com/uploads/1/3/1/4/131406925/82859b.pdfIn PDF document text
    • https://vabekozel.weebly.com/uploads/1/3/4/4/134487462/1833347.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/e1bf834b-6366-4973-bd62-65ff02f92f08/panasonic_cf-53_hard_disk.pdfIn PDF document text
    • https://a72a44ae-2aae-4d6a-a6c4-235301d0a62e.filesusr.com/ugd/57436b_b845f67142274687a2715a606ddcec47.pdf?index=trueIn PDF document text
    • https://43e3b293-20b6-4b74-9f7d-0eefffb4d2df.filesusr.com/ugd/11595e_533c4be8656c40b3b9adfc6f4439155e.pdf?index=trueIn PDF document text
    • https://7fd672c9-0ac8-42d3-9d3c-9ebb2fbea2b4.filesusr.com/ugd/92785a_667bba36d16b4eadbdaf33d77969dc7d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f52d911-7a32-44d7-bce8-1c2b5e31897a/sazasewipejo.pdfIn PDF document text
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_374723410d9e49158e8405ff635b56c4.pdf?index=trueIn 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_off00017be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BE7 5448 bytes
SHA-256: 21eabfc2b428ce7b6bda8a0e701b361422f76d04079215442742058f8998e6f0
font_01_sfnt_off00018e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E5B 14024 bytes
SHA-256: fe83df51f20550e707bedd72b9c164dae084ae45dbed8baed3ea38020128a273
font_02_sfnt_off0001bcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BCDE 16172 bytes
SHA-256: 6f99148c9e9e8b0d9db234005d116be5a63e77890736c2cd1cf293b5806865f9

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