Malicious PDF — malware analysis report

Static analysis result for SHA-256 9966c54087d86a1e…

MALICIOUS

PDF

65.3 KB Created: 2020-11-24 21:06:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f15ba6f029f66cb3ab3f7fb8c0024537 SHA-1: 1d564e1b8e932a941228365510e1178727215e65 SHA-256: 9966c54087d86a1e3fe4032340f19e012ef1f741ab97182fb9d8c6f234e223a0
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate this behavior. The presence of a URL with 'utm_term=marvel+comics' suggests a lure related to popular culture to entice clicks. ClamAV detection and ML classification further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://traffnew.ru/strik?utm_term=marvel+comics+%25231000+d23+for+sale
    • https://gabozagabu.weebly.com/uploads/1/3/4/5/134506959/jifilimilero.pdf
    • https://dakovogusuzulex.weebly.com/uploads/1/3/4/5/134595229/849743.pdf
    • https://sanuvexugivi.weebly.com/uploads/1/3/1/6/131606490/nozivo-xewud-gijiwelu-romitojagemumos.pdf
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/ce02014a20d.pdf
    • https://kowonuzadanovit.weebly.com/uploads/1/3/4/6/134686130/092322b81c5e611.pdf
    • https://lidovoji.weebly.com/uploads/1/3/4/3/134313359/kudewulixoz-gizurilebeguva.pdf
    • https://tetulivul.weebly.com/uploads/1/3/4/4/134401277/xiwuxut_sanovezis_nopom.pdf
    • https://lomasegikuporot.weebly.com/uploads/1/3/4/8/134846826/xogimurinejamub.pdf
    • https://moxowikoxub.weebly.com/uploads/1/3/4/0/134096036/c590ae.pdf
    • https://cdn-cms.f-static.net/uploads/4368978/normal_5f994afc5eb31.pdf
    • https://bibatuzasofobi.weebly.com/uploads/1/3/4/8/134879938/xolamijofo_pibok_didikumaki_levagefubumuraw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mibiwivanetuj/monthly_current_affairs_in_english_2019.pdf
    • https://s3.amazonaws.com/netinuwa/telugu_movie_video_songs_mp4.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_off0000c51f.bin
6b1cc0f2a561dda4cb65c952b24cacdd34503b1aeba956266a6482edd7f09f6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC51F 5008 bytes
font_01_sfnt_off0000d624.bin
f9610d5535214d9c38fd9775d4e8749686bbac86fa833be88d0ace39e8ca729d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD624 10104 bytes

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