Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a97c4af913e104…

MALICIOUS

PDF

83.0 KB Created: 2021-05-16 05:40:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: aa35a0f15339b530e788a844f1620e19 SHA-1: 93014e458d2dfeb6e241aa513131eeab87b1c60a SHA-256: a5a97c4af913e1049ca0bca35ad5ec303788115033dacd2afdea182e69af6d80
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 0.9997

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://xajibur.ru/strik?utm_term=what+words+begin+with+the+letter+k PDF link annotation
    • https://cdn.sqhk.co/natefisaka/hdgd9cm/cute_doll_wallpapers_for_facebook_profile_picture.pdfIn PDF document text
    • https://cdn.sqhk.co/nexasolonit/ihiBwge/nabiboxemiraxawaja.pdfIn PDF document text
    • http://nedavupagisezim.mygamesonline.org/bliss_calculus_of_variations.pdfIn PDF document text
    • http://urro-hu.com/how_to_use_quotations_with_a_question_marksia1u.pdfIn PDF document text
    • http://texno3ua.com/64286408650vpmkf.pdfIn PDF document text
    • https://cdn.sqhk.co/womawuxinuge/Jjdhcj6/sanulobizokikete.pdfIn PDF document text
    • http://wujejejifi.mygamesonline.org/the_blue_book_of_grammar_and_punctuation_download.pdfIn PDF document text
    • http://wamuwosola.mygamesonline.org/car_engine_parts_names_with_pictures.pdfIn PDF document text
    • https://cdn.sqhk.co/sawusuzi/xUjemUu/14072396802.pdfIn PDF document text
    • https://cdn.sqhk.co/rozopebak/aiegehd/walking_dead_movie_date.pdfIn PDF document text
    • https://cdn.sqhk.co/jalinutaxos/wuygxjd/sweet_potato_wedges_nutritional_information.pdfIn PDF document text
    • https://cdn.sqhk.co/sosobita/Jshgiay/highway_to_hell_chords_piano.pdfIn PDF document text
    • https://cdn.sqhk.co/bilanogakiw/hfuhd3z/45737084277.pdfIn PDF document text
    • http://babusokojanog.sportsontheweb.net/algebra_2_textbook_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xepalufozakot.epizy.com/18550571149.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/how_to_use_garrett_ace_300.pdfIn PDF document text
    • http://debetofewozuri.epizy.com/73228150227.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/50458631767.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/balancing_equations_worksheet_part_2_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/63525690802.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_off000104cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CC 5396 bytes
SHA-256: 97a9b46e1f23d3c235ac4fae28f449899ad87aa0b205e25966aa0b02d8e86905
font_01_sfnt_off00011736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11736 11564 bytes
SHA-256: f031e818861d2514977cc6fd519bc03b34435dd1c2a22b7412a267ddf528dd9d

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