Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b949601b5ff81f…

MALICIOUS

PDF

72.3 KB Created: 2021-02-25 22:02:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: fc8aa1e318c73a76b4b0081ed6b10eb8 SHA-1: 5731b20add7a7f8c496519e9a82a0b3f39c24bf9 SHA-256: c7b949601b5ff81f0b51f37de8db636d468d249b9a247e0ee50a6589e6eec65a
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm or a phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the nature of these links, indicating they are hosted on disposable domains and likely used for SEO manipulation or to redirect users to malicious content. No scripts were extracted from this sample, but the presence of external URIs and the link farm heuristic strongly suggest the document's purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://seumenha.ru/wix?keyword=ten+con+trai+bang+tieng+anh PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454678/normal_602a545837333.pdfIn PDF document text
    • http://trudogoliya.online/how_to_do_half_equations_in_chemistry980i0.pdfIn PDF document text
    • https://xejuxomezul.weebly.com/uploads/1/3/1/6/131637030/4749936.pdfIn PDF document text
    • http://businessoutsourcing.org/nuragorejezuu39lv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384819/normal_601f40ee10ff3.pdfIn PDF document text
    • https://bojufare.weebly.com/uploads/1/3/1/0/131070992/7355480.pdfIn PDF document text
    • http://chebsvet.ru/nupexapiw7eib.pdfIn PDF document text
    • http://astrology-personal.online/xuzuzituxx4827.pdfIn PDF document text
    • http://rineset.xyz/kuvovinavigirotibv2dhj.pdfIn PDF document text
    • http://study-english-04.space/womens_formal_dresses_with_pocketsp1v2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443354/normal_602051f0d0f19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418013/normal_6011a3c247cfc.pdfIn PDF document text
    • https://livadasim.weebly.com/uploads/1/3/4/3/134312527/repawa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447878/normal_602369506ca9e.pdfIn PDF document text
    • http://solent.bar/easy_crochet_afghan_patterns_for_beginners_freegb71q.pdfIn PDF document text
    • http://circulshtangcalip.website/sowolusebezomanorapebifucvhr.pdfIn PDF document text
    • http://presentinsta.site/xukujisejepumanacc12v.pdfIn PDF document text
    • http://boevoenlp.com/bus_simulator_original_2015_download9n54j.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/cfa_level_2_study_planvp1ma.pdfIn PDF document text
    • http://rollernefrit.xyz/extra_deep_pocket_queen_size_fitted_sheetsauvey.pdfIn PDF document text
    • http://rm-swis-mine.com/toms_guide_laptop_reviewejam0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FD 4940 bytes
SHA-256: 9bbd38ba474e14ec9d8133302550ab281fb32ece80d5afc1dcf520e9e5a8f3b9
font_01_sfnt_off0000f1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C6 9872 bytes
SHA-256: ca849af43a3ad139045e1dc854f7b6b302eeaaf7c92b19c3349792ba0aac02cc

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