Malicious PDF — malware analysis report

Static analysis result for SHA-256 079c9d59a36d3faf…

MALICIOUS

PDF

68.3 KB Created: 2021-04-02 20:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7980a9c0e40ed489795fd7a1b63a9bce SHA-1: a3b6763ed32cb4d3924aa0300e0fa021527c8b8f SHA-256: 079c9d59a36d3faf630a1acc092572b8faa05c7f29ce79c75cb80d3e675f0d37
226 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. The ClamAV detection further confirms its malicious nature. The document body is heavily obfuscated, but the presence of URLs suggests an attempt to redirect the user to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://midufefew.ru/wix?keyword=mass+mayhem+3+unblocked PDF link annotation
    • http://andyhongdigital.com/xodijibesipigezbez0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477649/normal_5feb486eaddff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418764/normal_5ff26609e50fe.pdfIn PDF document text
    • http://steblin.pro/31644981187bgmu3.pdfIn PDF document text
    • https://gaburidukir.weebly.com/uploads/1/3/4/4/134463400/kexetinaxejuni_womolejujebeg_fusasogutigaze.pdfIn PDF document text
    • https://kujiguvasate.weebly.com/uploads/1/3/4/5/134584602/1f82137e3e043.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485443/normal_604ba5fc48004.pdfIn PDF document text
    • https://cdn.sqhk.co/loberutebe/c4xhahi/table_tennis_games_for_pc_free.pdfIn PDF document text
    • https://fejejupusojovif.weebly.com/uploads/1/3/1/4/131483068/9803588c44d85.pdfIn PDF document text
    • https://mosuvixixe.weebly.com/uploads/1/3/0/9/130969854/paribejorit.pdfIn PDF document text
    • https://jipafedi.weebly.com/uploads/1/3/0/8/130813136/4d81c05fd02.pdfIn PDF document text
    • http://privateguardingserviceagainstdanger.site/jagakopwryb.pdfIn PDF document text
    • http://leftoutclub.com/1585486272yofib.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/ZlTicfe/14820466133.pdfIn PDF document text
    • https://fufaguda.weebly.com/uploads/1/3/0/7/130739251/1131235.pdfIn PDF document text
    • http://themarkuzmusic.com/711768709188xci.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3b201d0-072c-4d3c-bd08-5d9f2f1f3014/besuxirotazegofoxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15560d45-52a0-4dc4-8335-7c2b327d5063/18975234789.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b38ac246-366a-4907-87e8-15215d4b3b02/madiwalesekagij.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_off0000ce72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE72 5556 bytes
SHA-256: efa13e2d2b669d8cf7f9ccb4503f4ee74d5b12452a5e28b9ca52e4568d1b46e8
font_01_sfnt_off0000e145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE145 10300 bytes
SHA-256: 9c9e2037e1e49d5492b8213c40598f86d3650f7aacf0530ded1c54390a30dccd