Malicious PDF — malware analysis report

Static analysis result for SHA-256 366fe4f9ee81623b…

MALICIOUS

PDF

74.2 KB Created: 2021-04-02 03:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0402b9f0c8e1a199ca9757e8e7fa6e18 SHA-1: 91e95e1d6b5420e95981c89c57d93dd9616babe5 SHA-256: 366fe4f9ee81623bbf2c7b2126254cbda4a947fe94ece99d86b2d7feb4b8f091
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO manipulation or directing users to malicious sites. Heuristics indicate a link farm on disposable hosting, and ClamAV detected it as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to potentially harmful content. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/award?keyword=jolly+phonics+1+pdf PDF link annotation
    • http://reduslim-italia.website/how_often_does_robinhood_pay_dividends4i19k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410441/normal_5fe8d1bbee957.pdfIn PDF document text
    • https://nawivavunof.weebly.com/uploads/1/3/4/6/134669961/7a04514fcf9203.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474191/normal_604d1397e95b5.pdfIn PDF document text
    • http://juzajikadig.22web.org/all_the_stars_are_coming_out_tonight_jon_boden_lyrics.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471235/normal_5ffe4d2adadc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405945/normal_6058566a59de0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385612/normal_6045f42479597.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459326/normal_6052410cb6d7c.pdfIn PDF document text
    • http://kurewegunopef.66ghz.com/92393373046.pdfIn PDF document text
    • http://instacopyrightcenter.com/s1_together_23_island_lyricsoaw9h.pdfIn PDF document text
    • https://jutonoxefakevuw.weebly.com/uploads/1/3/1/4/131454335/koraz.pdfIn PDF document text
    • https://getaforufuzok.weebly.com/uploads/1/3/4/7/134733873/681991d4337cb97.pdfIn PDF document text
    • https://pegugigatusib.weebly.com/uploads/1/3/4/4/134460290/8110234.pdfIn PDF document text
    • https://mufuxavezefajox.weebly.com/uploads/1/3/4/4/134497947/7e2a291cb232d65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478687/normal_6031220614432.pdfIn PDF document text
    • https://kibanelamuvudu.weebly.com/uploads/1/3/0/9/130969844/mofasagidewimakiwozu.pdfIn PDF document text
    • https://pijawofixogut.weebly.com/uploads/1/3/4/0/134017865/6927401.pdfIn PDF document text
    • https://lobovalosidim.weebly.com/uploads/1/3/1/4/131437181/tezoleki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486193/normal_5fd15317bc30b.pdfIn PDF document text
    • http://bilabugova.iblogger.org/orbit_er_n_grab.pdfIn PDF document text
    • https://vavuxajibibugu.weebly.com/uploads/1/3/4/4/134472661/8614563.pdfIn PDF document text
    • http://korecos.ru/22124363436t9ekb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bezopiwuzalobit.rf.gd/pagexel.pdfIn PDF document text
    • http://miwunomo.epizy.com/argos_catalogue_2020.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_off0000e1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F4 5080 bytes
SHA-256: 1639a362e720cf1e2085b694f89398f9154f189d57a4e38e8681361dcdbf66ec
font_01_sfnt_off0000f351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF351 12052 bytes
SHA-256: 0dd778905c08d34f2f710700ef986789f9bd28c4f6a6a6ec79ac6722784c63d8