Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e8349e76b2b20a7…

MALICIOUS

PDF

84.9 KB Created: 2021-02-19 15:46:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b6956b9645a510b5227d5a05c70d5fb SHA-1: ebadff82a0e5d9c4c97fb4b264c4af74be39ac35 SHA-256: 9e8349e76b2b20a7b9e90aab091a050f5645f982a33a532612b10a4bb94012a4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one prominent link pointing to 'https://bologen.ru/wix?keyword=silk+bbc+episode+guide'. This suggests a link farm or phishing attempt. The ClamAV detection and ML classifier also indicate maliciousness, specifically flagging it as 'Pdf.Phishing.Trojan'. While no scripts were directly extracted, the PDF structure and embedded URIs strongly suggest a phishing or malware distribution vector.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/wix?keyword=silk+bbc+episode+guide
    • https://gariligiradafa.weebly.com/uploads/1/3/4/0/134041078/feacb4.pdf
    • http://kotuputepoworug.22web.org/rilebu.pdf
    • http://katowad.22web.org/consumer_reports_free_tv_settings_optimizer.pdf
    • https://labekefetimobu.weebly.com/uploads/1/3/0/7/130739294/jinibowizila-givisox-malomopovamu.pdf
    • http://lolabarafusiru.iblogger.org/godokuwanexipapinuzexamo.pdf
    • https://rixagaxovexi.weebly.com/uploads/1/3/4/0/134000332/goxoniwogaro.pdf
    • https://gajebafanagifim.weebly.com/uploads/1/3/2/8/132815836/8925974.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tetofamuxulil/1188303230.pdf
    • https://s3.amazonaws.com/ragejufa/newer_anticoagulants.pdf
    • http://numebazo.rf.gd/master_forge_grill_charcoal.pdf
    • http://rurubafemiw.rf.gd/woguzogaguzifodal.pdf
    • http://wilazetifoka.epizy.com/key_informant_interviews_methodology.pdf
    • https://s3.amazonaws.com/risisipajole/25163891610.pdf
    • https://s3.amazonaws.com/tamobalasu/karitesufukuwo.pdf
    • http://gonidiwofove.epizy.com/confluence_page_properties_report_sort_not_working.pdf
    • http://pufiwuwa.epizy.com/fopijibetunudotezonirefo.pdf
    • https://s3.amazonaws.com/kiremefegonar/nenos.pdf
    • http://sawexelisam.epizy.com/32033156949.pdf
    • http://xuxedawijepi.rf.gd/fazalanizozumijuxima.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_off00011204.bin
3ce33e7a800def09b78edb5746f8bc58a29462ca59183d9cd32bdfd57a0e23f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11204 5244 bytes
font_01_sfnt_off000123ea.bin
880d13c5405ab0a45877aa8a34f2f4a3e1c0a290312bb73693e473b5ef658600
pdf-font-stream PDF embedded font (sfnt) at offset 0x123EA 10160 bytes