Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b1334fe922fc67…

MALICIOUS

PDF

70.8 KB Created: 2021-03-08 07:21:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d9bc06322ea36265d143f18ae85e9720 SHA-1: 1732cfef937eb065ba7b8d237c5f326d5826d097 SHA-256: b7b1334fe922fc67108b523c790220f5e535273342ecc8b0cf0426ddd363e51b
186 Risk Score

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 domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=pathfinder+inner+sea+region+map PDF link annotation
    • https://lulofaki.weebly.com/uploads/1/3/1/4/131453598/2885917.pdfIn PDF document text
    • http://xumupizaxuto.scienceontheweb.net/zojalusojivonujon.pdfIn PDF document text
    • http://datingdate.site/garmin_vivofit_3_issuesvg9ds.pdfIn PDF document text
    • https://buranujepexu.weebly.com/uploads/1/3/4/3/134339299/b77bbee.pdfIn PDF document text
    • http://feyakast.online/93767338815vd3pg.pdfIn PDF document text
    • https://nisivijuwowog.weebly.com/uploads/1/3/0/8/130813757/vanitemux.pdfIn PDF document text
    • https://debozapo.weebly.com/uploads/1/3/1/1/131164198/satewa.pdfIn PDF document text
    • https://vukojudal.weebly.com/uploads/1/3/5/3/135317211/543e00.pdfIn PDF document text
    • http://obmenkalnr.online/2315652463c059y.pdfIn PDF document text
    • http://bathforlegs.xyz/woxodozixodutoxivqgbdu.pdfIn PDF document text
    • http://cmb-eco.com/23693302469shkfy.pdfIn PDF document text
    • http://i-men.ru/bleeding_steel_movie_in_tamilrockersucupc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446283/normal_600c0ee0ef1b0.pdfIn PDF document text
    • http://dashcamtopbest.com/407189474427lw4i.pdfIn PDF document text
    • http://apkweb.net/what_substances_are_excreted_by_the_kidneysktzwh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472208/normal_600f8fe8b756d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405945/normal_60327bcd4169d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jumuvurerurulap.rf.gd/famorufegibarudovavixa.pdfIn PDF document text
    • http://liduvitulugug.onlinewebshop.net/how_tall_is_neil_degrasse_tyson.pdfIn PDF document text
    • http://metepukiwameme.epizy.com/14715800428.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_off0000d7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DF 5424 bytes
SHA-256: a1e18092f9b2741f773d82c531fea098b4e04bb91ea0d5c4693786a9206a021c
font_01_sfnt_off0000ea2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2A 10668 bytes
SHA-256: 1517a9c839ecd39a72e564cd4993ea422b34b21a888af5fe73873c89820e6c41

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