Malicious PDF — malware analysis report

Static analysis result for SHA-256 71f9d99d7d013811…

MALICIOUS

PDF

80.9 KB Created: 2021-02-18 17:30:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e8d850d1c377929736624add6e5699e0 SHA-1: d3b6ca63e647dade46a8af9f93d566a561212897 SHA-256: 71f9d99d7d013811a234345a07e530981f834e506694585b6bbb574b368281ba
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links pointing to disposable domains, a common tactic for SEO link farms used to distribute phishing content or malware. The embedded URLs and the structure suggest it's part of a larger campaign to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://bologen.ru/strik?utm_term=is+tempurpedic+adjustable+base+worth+it PDF link annotation
    • https://nozabuzewetuk.weebly.com/uploads/1/3/2/6/132683147/wetinerawonef_bofanonir_lozefatulasiwuf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479222/normal_60006943de866.pdfIn PDF document text
    • http://lenudes.com/robot_vs_zombies_game_unlimited_money8qx62.pdfIn PDF document text
    • https://cdn.sqhk.co/zarepowake/hqsLvhf/86168953011.pdfIn PDF document text
    • https://tuzunogosur.weebly.com/uploads/1/3/0/8/130815213/3040377.pdfIn PDF document text
    • https://cdn.sqhk.co/nitunoda/gchhjjw/my_story_maker._com.pdfIn PDF document text
    • http://formulamoney.top/bean_1997_movie_720pokblh.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/dha63jg/80340754936.pdfIn PDF document text
    • https://zetaxufonepijak.weebly.com/uploads/1/3/4/3/134353616/funikozozabanonef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469353/normal_600f2f3a48065.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/7yTXcxH/exploration_lite_craft_1._0._8_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/wosipuvetot/hjZW6dU/unfollow_for_instagram_pro_1._3.pdfIn PDF document text
    • http://it50life.pro/bosch_classixx_washing_machine_service_manual34f2t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387716/normal_600bd1d7c24ea.pdfIn PDF document text
    • https://gugozakeku.weebly.com/uploads/1/3/4/5/134588211/senaxilekopazif-deboguve.pdfIn PDF document text
    • https://linulozaf.weebly.com/uploads/1/3/1/4/131437298/1505860.pdfIn PDF document text
    • http://smartycredit.info/92617607974zphjc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370525/normal_5fe844892f85c.pdfIn PDF document text
    • http://securityverifiedservices.com/credit_karma_score_different_than_credit_reporto5rti.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_off0000fc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC61 5560 bytes
SHA-256: bc13800fee1e600c07229410339f2e2d53fa03eea56f6e73bef79f6d6fc80f2f
font_01_sfnt_off00010f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F24 11396 bytes
SHA-256: cff68c1be51debe835637a7f906c89b9ad57e6ee625b7f64ad57549a85fe842d

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