Malicious PDF — malware analysis report

Static analysis result for SHA-256 581b182c7bd3e197…

MALICIOUS

PDF

80.1 KB Created: 2021-02-23 09:36:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: b84ccf4b8674521e9e55c3b14a1a70f1 SHA-1: c787832f2f4ba1ee0e27a91971b339e6bad52aa3 SHA-256: 581b182c7bd3e19760b9ea2ac45ee08284e64eda41db04f4a4d69568d082bf00
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, with a significant heuristic indicating it's a link farm on disposable hosting. One of the primary URLs, 'https://baarspo.ru/strik?utm_term=what+do+weather+icons+mean', and a sample URL from the link farm, 'http://blancer.xyz/83741654460bp64h.pdf', are flagged as suspicious. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the overall structure and URL analysis point towards a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=what+do+weather+icons+mean PDF link annotation
    • http://blancer.xyz/83741654460bp64h.pdfIn PDF document text
    • http://br1.red/49527587820rcccv.pdfIn PDF document text
    • https://cdn.sqhk.co/xopigotax/hgjuheL/stick_order_empire.pdfIn PDF document text
    • https://fefefilax.weebly.com/uploads/1/3/2/7/132712664/wajafesipo_vejuxuje_gojojeni_noruden.pdfIn PDF document text
    • https://cdn.sqhk.co/kopenanum/dLMgjha/gladiator_glory_apk_hile_indir.pdfIn PDF document text
    • http://shopwithsale.website/hedwig_s_theme_violin_sheet_music_easyt2d61.pdfIn PDF document text
    • http://loxalobew.22web.org/cuisinart_cbc-00_manual.pdfIn PDF document text
    • http://yogistika.space/84109330164mu25s.pdfIn PDF document text
    • http://prizinsta.info/70467844718byo09.pdfIn PDF document text
    • http://copyright-helps-team.com/criminal_justice_reform_jobs_near_metwwbm.pdfIn PDF document text
    • http://mebelintera.ru/odisha_map_download_in_englishzv644.pdfIn PDF document text
    • http://sacredname.ru/87952470827wq964.pdfIn PDF document text
    • https://cdn.sqhk.co/dasekizob/1iFFtNC/catfishing_rigs_for_channel_catfish.pdfIn PDF document text
    • https://cdn.sqhk.co/zarejesorufo/fghbPjb/87851634951.pdfIn PDF document text
    • http://tourist.fish/msc_computer_science_entrance_exam_question_papersqt4au.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fafezevasuba.rf.gd/delhi_building_bye_laws_2017.pdfIn PDF document text
    • http://xivavop.rf.gd/afterlight_mod_apk_revdl.pdfIn PDF document text
    • http://kupavojos.epizy.com/72170904513.pdfIn PDF document text
    • http://tipakofixu.epizy.com/42708408704.pdfIn PDF document text
    • http://salivokeru.epizy.com/dopumewutexexubaxuxureg.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_off0000fbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB9 5252 bytes
SHA-256: ad8a884cb946d14982778764fbd8924a641b2713506e710fa14aafe81d8f7f56
font_01_sfnt_off00010d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D83 11136 bytes
SHA-256: 10164fe879086f9e4acc763329d6fa936da1465f438ed1db6622efdf4e8673cb

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