Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ea7dc713e4b51a2…

MALICIOUS

PDF

87.8 KB Created: 2021-03-16 00:40:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bc7983a53a83cba8d8946e9cf63e6e16 SHA-1: b114cb1cb16d7105962e909d27b4e68a207ca37a SHA-256: 6ea7dc713e4b51a2db20f25873de56f3502785a6ce9b7f742bd3007f6c570eb8
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to redirectors and SEO farms, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' strongly suggest this. The ML classifier and ClamAV detection further confirm its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://druttle.ru/strik?utm_term=how+to+write+a+fiction+book+outline PDF link annotation
    • http://cmb-societe.com/murder_mall_escape_crazy_gameskvus5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446034/normal_60391f131b113.pdfIn PDF document text
    • http://sudejiw.22web.org/40652686571.pdfIn PDF document text
    • http://walkover.me/11010592913gqvi9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505102/normal_603b2547367a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461481/normal_6037eb5f12d32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401691/normal_6018cc913a072.pdfIn PDF document text
    • http://youla-24.cc/war_horse_book_coverm87jw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390056/normal_60128dda3e75e.pdfIn PDF document text
    • http://dostafood.xyz/replacing_walking_belt_proform_725tl_treadmill5yibw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/12510939917.pdfIn PDF document text
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_0dcd36f2c98d412a967825255cb1b1df.pdf?index=trueIn PDF document text
    • http://sixobujogek.rf.gd/94843488224.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/xanet.pdfIn PDF document text
    • https://28ae28a3-27cc-4d38-be83-0de1f6925f83.filesusr.com/ugd/454016_b09e870a333c4c62aa03c9c12a98e3e0.pdf?index=trueIn PDF document text
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_12c7c416bb004305a90a84db21a888ac.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/firadoriwugiti.pdfIn PDF document text
    • https://s3.amazonaws.com/pojikovewijeja/wakutosakosuvunimiwe.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/47487682233.pdfIn PDF document text
    • http://fasosusa.epizy.com/optiplex_755_vga_drivers.pdfIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_e14bf1ee1ed9405f91757dc4feb37120.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/mokevirapuxu.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/wotozedibadonefezateb.pdfIn PDF document text
    • http://vipifusofired.epizy.com/baby_einstein_jumper_manual.pdfIn PDF document text
    • http://pivukezafubajeg.rf.gd/bichagadu_naa_songs_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/57128496219.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/nigupofuvijopibu.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/hyphenated_adjectives_worksheet.pdfIn PDF document text
    • https://c78267de-509c-4cb0-9394-6b21b7876e04.filesusr.com/ugd/290ce3_5d073dcfeb3a4afca6d8351c094f4769.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEB 4956 bytes
SHA-256: 94c3c7a836519310fa644e947cc9002708963f94f2475648f3f41cabd8506936
font_01_sfnt_off00012bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BED 10996 bytes
SHA-256: e497852b903dec390c2e76ce797b1daaa607dbc5817fdf842af59a96c6cf0bcc