Malicious PDF — malware analysis report

Static analysis result for SHA-256 8422a8885ee31ce1…

MALICIOUS

PDF

79.5 KB Created: 2021-03-05 04:31:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 045bafccfb8a7ef16df3c982d7164e22 SHA-1: 9f9904ec5054b63f7443cec7d61083abed975861 SHA-256: 8422a8885ee31ce1ed94229fc7bc872500a9c16c601095c7e994e75e365b7023
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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://baarspo.ru/123?utm_term=solution+definition+chemistry+example PDF link annotation
    • http://xplaintome.ru/in_terms_of_commonly_traded_organizaidju2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494673/normal_601f139dba78a.pdfIn PDF document text
    • https://dipalowijoje.weebly.com/uploads/1/3/0/9/130969855/518ce1dee311b94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423750/normal_5fd67da30b87b.pdfIn PDF document text
    • http://xibawolafubiz.getenjoyment.net/audacity_english_in_hindi.pdfIn PDF document text
    • http://gexopidikimo.mygamesonline.org/classical_guitar_exercises.pdfIn PDF document text
    • http://yildirimotobursa.com/lesson_8.2_skills_practice_answers_algebra_2llraa.pdfIn PDF document text
    • http://lagulesuko.medianewsonline.com/free_movie_maker_programs_for_pc.pdfIn PDF document text
    • http://gakawisogafuga.mygamesonline.org/wu_tang_clan_show_hulu_cast.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486199/normal_601e135e82b9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411001/normal_600b3fed4476e.pdfIn PDF document text
    • http://helper-badges.com/does_a_gas_hot_water_heater_have_a_reset_buttonmxvyu.pdfIn PDF document text
    • https://cdn.sqhk.co/xogovofofi/ifXT4id/2271285091.pdfIn PDF document text
    • https://cdn.sqhk.co/mukujoripu/gdWwEhc/flashlight_song_lyrics_espanol.pdfIn PDF document text
    • https://rubosesizip.weebly.com/uploads/1/3/4/7/134744628/wikuxefegez.pdfIn PDF document text
    • http://warewakeb.sportsontheweb.net/cargador_de_baterias_schumacher_se-82-6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474471/normal_600e640ba83de.pdfIn PDF document text
    • http://dakisemakegag.sportsontheweb.net/confessions_augustine_sarah_ruden.pdfIn PDF document text
    • https://bomefojidog.weebly.com/uploads/1/3/2/6/132695402/valojejufexelawa.pdfIn PDF document text
    • https://rejukikigukaw.weebly.com/uploads/1/3/5/3/135387704/3d9bf39540.pdfIn PDF document text
    • http://lavkavkusa.store/lixapojudip1rmxg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bodegifu.atwebpages.com/lincoln_210_mp_manual.pdfIn PDF document text
    • http://tiwosutodegadax.onlinewebshop.net/82212636933.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_off0000f7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FB 5668 bytes
SHA-256: f95ce89c1c1ff117c42c6f9351e86d6880f1031ed62b1ac3004c3ce59a92dd07
font_01_sfnt_off00010b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B29 10984 bytes
SHA-256: 498710d6b30aba65a9af3f50d7fd1cfb319c8678a9f1ff1212ad8fd4e97857db

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