Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8bf062314a3419…

MALICIOUS

PDF

78.8 KB Created: 2021-05-19 19:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4d97ea4fa115921fb0a72738e64704cb SHA-1: cacb513a944bd97e35d69bc9a84039db401a1b0f SHA-256: 8f8bf062314a34190ec1e982d2eed3d3b18eb28434ea0dec8cc48c00bc934c14
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicative of a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. The embedded URLs, such as 'https://nipisod.ru/strik?utm_term=autor+del+libro+soy+sano+con+la+medicina+natural', are likely used to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://nipisod.ru/strik?utm_term=autor+del+libro+soy+sano+con+la+medicina+natural PDF link annotation
    • https://pabalosuto.weebly.com/uploads/1/3/0/8/130813917/3942822.pdfIn PDF document text
    • https://jesomufufasak.weebly.com/uploads/1/3/1/8/131872286/peresowude.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486192/normal_606b72aa99041.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387698/normal_5fe1ae4a468ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369520/normal_602de1db305ed.pdfIn PDF document text
    • https://vinadesafabav.weebly.com/uploads/1/3/5/3/135305522/4817732.pdfIn PDF document text
    • https://reponobokuwe.weebly.com/uploads/1/3/5/4/135401207/vorexawupimusezakig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450438/normal_6000e61e70783.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447097/normal_60556f8c68317.pdfIn PDF document text
    • https://kuledeju.weebly.com/uploads/1/3/0/7/130775905/jedatamadizizuk.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://uploads.strikinglycdn.com/files/4493b4c2-15d5-40f7-bdd0-f760f61954b1/forex_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1e9be0f-beb6-4d13-b3eb-850a3e2d976a/8706304906.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3e9e18e-e82b-4cd0-9185-72e4186f3f14/39893239397.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a5883d4-8558-4786-86ae-29ffb73d7780/87427643818.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/423f607f-9362-4bed-980e-2b365e5ac6ed/saxuwij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c91522f9-0380-498a-8f00-4d09639b30db/59481608431.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9befc64e-644d-4a85-b0d3-3a5a4ba8f452/68474429299.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5fe7f2a-2b9d-4fe8-889e-f00afbcaaa4c/dopizotobebosujurew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d04e0da3-7ae6-477a-895a-576fabc89682/xatolasawexibevur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c467892-0e55-4f69-ab31-004b5bbd9750/bipovuramuponigazi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6345e36a-12a2-4a94-95c3-f418c719594e/when_you_love_someone_but_have_to_walk_away_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a86af2d7-40a5-46a4-a5ef-a8ce17175ce0/essential_grammar_in_use_edicion_en_espaol_descargar_gratis.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30A 5200 bytes
SHA-256: 5924fab692770355425c034992f11653190e59ceb3f7cee8a6b162735476e600
font_01_sfnt_off0000f49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49D 13340 bytes
SHA-256: 620fe46a5acd4ab133900cac905bfa39eba8f374a2bb34d4db72a89a484bc7ee
font_02_sfnt_off00011ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECD 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c