Malicious PDF — malware analysis report

Static analysis result for SHA-256 4937e6e0f157a397…

MALICIOUS

PDF

67.9 KB Created: 2021-03-17 04:43:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0d1f900b992176ade7615c2261e1fb65 SHA-1: c3c77dda383412fdacdce810b3e1f610447ccfa2 SHA-256: 4937e6e0f157a39749f094eae890a455eeafabfade9dd64819cae8d8cd4f76b9
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://soxebez.ru/wix?keyword=structural+engineering+reference+manual PDF link annotation
    • http://pozonewexoz.iblogger.org/tafixajukexepe.pdfIn PDF document text
    • https://cdn.sqhk.co/gotubosif/65iaCji/funny_captions_for_pics_with_best_friend.pdfIn PDF document text
    • https://cdn.sqhk.co/gapebeve/ghk824m/95400668865.pdfIn PDF document text
    • http://mekomob.getenjoyment.net/how_to_play_cyberpunk_2077_on_ps4_early.pdfIn PDF document text
    • https://tuzebomutiwok.weebly.com/uploads/1/3/1/3/131398369/niragubub.pdfIn PDF document text
    • https://gutavavoz.weebly.com/uploads/1/3/4/0/134000423/864a073.pdfIn PDF document text
    • https://dakubotamijez.weebly.com/uploads/1/3/2/7/132712147/jezikimova.pdfIn PDF document text
    • https://cdn.sqhk.co/kapideto/bPiiICX/easy_load_boat_trailers_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/raxipopu/Tiaiajd/hypoglycemia_newborn_guideline.pdfIn PDF document text
    • http://favarivizuna.medianewsonline.com/payment_of_gratuity_act_1972_amendment.pdfIn PDF document text
    • http://fodekofuxuvum.sportsontheweb.net/administrao_publica_gerencial.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lojarine.epizy.com/dolch_sight_words_tracing_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/bootstrap_datepicker_example_code.pdfIn PDF document text
    • http://rodexiguv.onlinewebshop.net/vetowaveg.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/how_to_use_char_broil_red_grill.pdfIn PDF document text
    • http://vexowiwoputam.rf.gd/80403103305.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/physics_textbook_class_11_cbse.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_off0000cb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB65 5124 bytes
SHA-256: 67c7206f38aac914055407919839dc7565d82582aa6b192ae4e2e5a71872d1c0
font_01_sfnt_off0000dcc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC4 11276 bytes
SHA-256: 6b9e9eab8fdce562e64ef48051f9ed623efbe97a1728aaabf9e1af172d69f765