Malicious PDF — malware analysis report

Static analysis result for SHA-256 a375c87797c968c1…

MALICIOUS

PDF

74.8 KB Created: 2021-03-30 02:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4fab4c871becce134ee765365aab02ae SHA-1: 54fb456c29a089e35f771d60103c5e4a2739fd10 SHA-256: a375c87797c968c1309d1d8a1763bfa69506df2712f2aee8066f34b8d7473aef
66 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9996

Heuristics 4

  • 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://seumenha.ru/strik?utm_term=craftsman+315+garage+door+keypad+not+working PDF link annotation
    • http://roselosudeve.sportsontheweb.net/livro_a_dieta_da_cabala.pdfIn PDF document text
    • https://dunewalowipeli.weebly.com/uploads/1/3/1/8/131856746/5866311.pdfIn PDF document text
    • https://zelubofiwexuf.weebly.com/uploads/1/3/4/2/134234915/numef_sirafexibadere_sutikevat.pdfIn PDF document text
    • http://tadefog.medianewsonline.com/varicela_en_el_adulto.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/how_to_see_my_computers_specs_windows_10.pdfIn PDF document text
    • https://rojanebe.weebly.com/uploads/1/3/1/6/131637229/lufuxusid-bupuw-fugetiki.pdfIn PDF document text
    • https://pepomujotopulog.weebly.com/uploads/1/3/4/8/134873529/1985387.pdfIn PDF document text
    • http://kejoxemubogese.mywebcommunity.org/letobanonuxikojawatow.pdfIn PDF document text
    • http://zhigina.ru/how_to_determine_age_of_rheem_water_heaterfcgpk.pdfIn PDF document text
    • https://kaguleturega.weebly.com/uploads/1/3/4/9/134904612/xupadivaduzomifijegu.pdfIn PDF document text
    • http://gazupoz.sportsontheweb.net/fewenebogigikegiwiwe.pdfIn PDF document text
    • http://helpcenterbusiness.xyz/rorawaxekes3doq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_75bcbcf6223149819b237717a4086fa1.pdf?index=trueIn PDF document text
    • https://804b95bc-9ca4-448d-a094-5a8e1ff69a26.filesusr.com/ugd/99d1da_fb31382405474e2c8e46a565f2976111.pdf?index=trueIn PDF document text
    • https://f4dd034e-00c7-465c-b850-fb2d75accad5.filesusr.com/ugd/769f78_cad32fe596354f21aca671125ac66911.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/raiders_news_bleacher_report.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/4067592123.pdfIn PDF document text
    • https://s3.amazonaws.com/gusule/basic_english_grammar_exercises_for_beginners.pdfIn PDF document text
    • http://vijelovisisojo.rf.gd/garabeman.pdfIn PDF document text
    • http://ralivapoked.epizy.com/mogapupipikikir.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/66942694235.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/51958262601.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_off0000e4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E6 5832 bytes
SHA-256: aa25fcbe98aff4dcb904aa8be1380ed4497ee4960a3fe163830454e6cd5e0e2f
font_01_sfnt_off0000f8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CA 10760 bytes
SHA-256: a41a636b1ec5379bb922437c305d5e8bb720ded902f53c55676cc28fcfa39da9

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