Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c0934c6f2d79cce…

MALICIOUS

PDF

76.5 KB Created: 2021-03-31 02:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5158d38dcc40c7278401dcc56869bf8a SHA-1: 26e7d7e0266d4e82155542f413200451f0cb8ca3 SHA-256: 8c0934c6f2d79ccea8bd4bbc4d006de33040594b3128f56624c66280aa02d8e1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/wix?keyword=management+representation+letter+compilation PDF link annotation
    • http://gladkoe-telo.xyz/subolusemelefigovomezuvbwhtp.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/YzjbhbH/wyvern_creations_facebook.pdfIn PDF document text
    • http://melidagerukebel.sportsontheweb.net/bollinger_bands_trading_strategies_that_work.pdfIn PDF document text
    • http://ovca.space/shock_hipovolemico_fisiopatologiackug5.pdfIn PDF document text
    • http://bomepufibawil.scienceontheweb.net/lezitijazawetebed.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://jotitojimo.mygamesonline.org/how_to_prove_that_iron_is_more_reactive_than_copper.pdfIn PDF document text
    • http://raifaisentgo.online/aetna_better_health_pa_reconsideration_form2j9ek.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/waravusuvobuboxezoxeta.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/VjehaZV/chikki_emulator_mod_apk_unlimited_time.pdfIn PDF document text
    • http://hotita.space/the_stand_2020_air_time7f7ic.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvexudid/NKYxjcd/text_message_maker_with_emojis.pdfIn PDF document text
    • http://homebig.space/what_do_you_call_a_360_degree_angle9vaf8.pdfIn PDF document text
    • http://limaxinsto.xyz/piserurarelekib9h9e.pdfIn PDF document text
    • http://ligugiban.scienceontheweb.net/autonics_photoelectric_sensor.pdfIn PDF document text
    • http://keto-s1.com/its_kind_of_a_funny_story_quotes_movieztx27.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://liroporuki.myartsonline.com/cabbage_soup_diet_recipe.pdfIn PDF document text
    • http://mekasesajiw.onlinewebshop.net/in_the_afterlight_book.pdfIn PDF document text
    • http://palelezugob.onlinewebshop.net/xezomesazabisixu.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_off0000efe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE2 5260 bytes
SHA-256: 130f51e457e70c5b23357ae48f5c9d6721d5a6ff2cf5e1275bf5acb788a86271
font_01_sfnt_off000101ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BA 10100 bytes
SHA-256: 46947e223536055a89f81c985f9acd0501cc0ad343039c88089afb944fa65168

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