Malicious PDF — malware analysis report

Static analysis result for SHA-256 39139ee4af1015b9…

MALICIOUS

PDF

74.9 KB Created: 2021-03-05 09:51:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: c6d0ff37d19338e9edb9fbc2a4f33bb2 SHA-1: 4163c8aa31f2cb1da9863b8b0dfae6c15fb9591b SHA-256: 39139ee4af1015b934658cbcf100b34e0fa9930dc903e87a61ce26e1611990bc
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm pattern, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains a search query related to 'twilight book', likely a lure to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=what+will+the+new+twilight+book+be+about PDF link annotation
    • https://cdn.sqhk.co/budatumibowu/UgfhRYO/need_for_speed_rivals_cheats_ps4_deutsch.pdfIn PDF document text
    • https://midusafamiriron.weebly.com/uploads/1/3/4/7/134702540/f2414744ad6.pdfIn PDF document text
    • https://cdn.sqhk.co/devisojop/KoheZhe/vodaxufekuvusujoxaz.pdfIn PDF document text
    • https://vedaputenada.weebly.com/uploads/1/3/5/3/135318287/jutidepoxuradiloj.pdfIn PDF document text
    • http://loneresel.mygamesonline.org/sidolosirurudilibuj.pdfIn PDF document text
    • https://kevibudoja.weebly.com/uploads/1/3/0/8/130814666/xadez-nojabedusevaz-belukegi.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/ih9bUjd/bipunixom.pdfIn PDF document text
    • http://zofunubesosena.mypressonline.com/gulataxarugigepitoxero.pdfIn PDF document text
    • https://cdn.sqhk.co/kagaxavog/BidLlGH/jump_start_car_service_adelaide.pdfIn PDF document text
    • https://nizevamil.weebly.com/uploads/1/3/2/8/132814567/7638485.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/english_worksheets_for_grade_2_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/zisakokedazipisasujep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/532a2388-66cd-4a56-803a-6459fd3847c9/95744689094.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a154bdbc-c68f-4797-8a2e-bdb56e5c3c77/how_do_i_set_the_day_on_my_timex_indiglo_watch.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/10496263494.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/fabonevejunef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0bc4c4a-2da7-44c0-883e-2b57f793e970/40853265527.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e17a144-2ea6-4872-9886-4fe76106af81/learn_forex_trading_uk_free.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_off0000e9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C1 4980 bytes
SHA-256: e50c464287489423a08786db6cb7cb06492d1f50a56e1ce355adf1c822c1eb57
font_01_sfnt_off0000fad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD5 10624 bytes
SHA-256: d31c9d2af0d17cb8f48565d3c8454ee13f93fd7ffb9ae20553567fe81b1f71cf

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