Malicious PDF — malware analysis report

Static analysis result for SHA-256 48d498ff67f03b42…

MALICIOUS

PDF

72.1 KB Created: 2021-03-20 09:47:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 676a1b4993b091f2d06d84b68ecb7371 SHA-1: 1dab729cc2c299b79e4bf035675be84e81219142 SHA-256: 48d498ff67f03b423d07e311ced19856335e44c20e2637a001efb513ff927598
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings suggest it functions as a link farm, directing users to numerous external URLs, including one that appears to be a search query for 'munchie mania answers level 12'. This pattern is often used for SEO manipulation or to host phishing content. No scripts were extracted from this sample, but the presence of many external links points towards a malicious redirection or content delivery strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/wix?keyword=munchie+mania+answers+level+12
    • https://cdn.sqhk.co/dewobube/iib7ggH/81002189100.pdf
    • https://cdn.sqhk.co/tevotapomow/yV2iafL/blockman_go_pc_website.pdf
    • https://cdn-cms.f-static.net/uploads/4488566/normal_60277edf8f744.pdf
    • https://cdn-cms.f-static.net/uploads/4426957/normal_603f34096fae1.pdf
    • https://cdn-cms.f-static.net/uploads/4488135/normal_601f0b47ae455.pdf
    • https://cdn.sqhk.co/gafisasiwu/bYAVoif/diary_with_lock_app_apk_download.pdf
    • https://fowuwulavo.weebly.com/uploads/1/3/4/7/134754099/vilifubobalufo_kuwopizugebo_waminawokemesuv_sinafokojaj.pdf
    • https://static.s123-cdn-static.com/uploads/4421468/normal_5fedead1c014d.pdf
    • https://dimafivatoputir.weebly.com/uploads/1/3/4/4/134496040/tutodu-zexivad-nijigawejos.pdf
    • https://muvusawit.weebly.com/uploads/1/3/5/3/135392745/fefus.pdf
    • https://vexitibivomak.weebly.com/uploads/1/3/0/9/130969710/d4e3eea5.pdf
    • https://cdn-cms.f-static.net/uploads/4412599/normal_60484d7436da5.pdf
    • https://cdn.sqhk.co/puwidebudojo/ijgcghc/motorcycle_wheelie_trainer_spyder.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_536e753ea89a4fa2be065ccd3865a471.pdf?index=true
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_8324714a5c354775afb2306057c86436.pdf?index=true
    • http://furugavasipif.epizy.com/15145094287.pdf
    • http://wapofele.epizy.com/ti_sherlock_holmes_ton_tp.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deca.bin
e21585e8f64223dfd772c6a9803a5684514dc7d4d71c2f1dd8dc60c23ceefcd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDECA 5380 bytes
font_01_sfnt_off0000f10b.bin
079c0a360b942c39b819450a278d2bf7a98669f1a7f98954e8a487515788886e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF10B 10552 bytes

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