Malicious PDF — malware analysis report

Static analysis result for SHA-256 487a6762abed7f6b…

MALICIOUS

PDF

83.6 KB Created: 2021-04-02 16:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a02acbbddc84ebb629987e40bf8780f2 SHA-1: 7b3fd05ddad6d8de0f324ca6293fb96985b14104 SHA-256: 487a6762abed7f6bda7966de7742f99a63edf304478e39569ae82a4278153319
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URIs pointing to various domains, likely for SEO manipulation or phishing. While no scripts were directly extracted, the presence of embedded URLs and the nature of the link farm suggest it is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • 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://dugedepap.ru/award?keyword=c%25E1%25BA%25AFt+pdf+b%25E1%25BA%25B1ng+foxit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469633/normal_604e419221ed6.pdfIn PDF document text
    • http://nariwunuzaw.scienceontheweb.net/tunutulazawoxarajito.pdfIn PDF document text
    • https://cdn.sqhk.co/karapenakozi/ijjhRzK/dmv_traffic_accident_report_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405895/normal_5ff7087b8ccbe.pdfIn PDF document text
    • http://vclean-sale.shop/tugezud4g76f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497658/normal_602b229ec4504.pdfIn PDF document text
    • http://chambre.xyz/party_invitation_template_twinkl2lmd2.pdfIn PDF document text
    • http://baranaydin.org/network_science_albert_lszl_barabsimscpp.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxibila/dxWjdjd/world_war_3_game_xbox_one.pdfIn PDF document text
    • https://linazoforup.weebly.com/uploads/1/3/0/8/130814758/wasobitinufifu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366407/normal_6063a61dabd54.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366317/normal_5ff7aa6a3bd1a.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/how_much_to_lease_a_2020_lexus_rx_350.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377116/normal_605c468b6f6f3.pdfIn PDF document text
    • http://raisinshq.pro/690434736862o865.pdfIn PDF document text
    • https://gilawidukawopux.weebly.com/uploads/1/3/2/7/132741225/2469133.pdfIn PDF document text
    • http://xesapuwax.mywebcommunity.org/fulovuwavikerugujaxix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458618/normal_606013ebdfd54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403539/normal_6049768c191a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366388/normal_601a009712e06.pdfIn PDF document text
    • https://cdn.sqhk.co/sogefuluf/abhciic/five_90s_boy_bands_uk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gafodix.myartsonline.com/15602791416.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64B 5380 bytes
SHA-256: ea4c5cf872df9be8df7108d9721d760770cb46d5b66661549730fce95aae71b7
font_01_sfnt_off0000f7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E4 21932 bytes
SHA-256: 5df19d33102101b15d90b3ddb83271dc43a55e5bb1cd40c24b5ed94cdd39fb4b
font_02_sfnt_off000128e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E9 16376 bytes
SHA-256: c3d0ee408bee49a88931d2ac630a9fb52e88a46fabab5a72aa19e78bbe1d3826