Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ff98be90e5c3323…

MALICIOUS

PDF

78.2 KB Created: 2021-03-17 07:33:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1e230b488e6fdbc78b9bdef12745db6f SHA-1: a39298e2a619da3d07cf55ddc27d1571278864ea SHA-256: 6ff98be90e5c332323c76dcf1d98a2c1f3f74d982e1da0d51f855e53418ac687
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by both ML classification and ClamAV, flagging it as a phishing trojan. The document contains a large number of external links, many hosted on disposable domains, suggesting it's part of a link farm designed to redirect users to malicious sites. The primary lure appears to be a search query about Wendy's taco salad, which is likely a deceptive tactic to encourage clicks on the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=is+wendy%2527s+taco+salad+good+for+you PDF link annotation
    • http://gakukuketisalum.scienceontheweb.net/multiple_case_study_design.pdfIn PDF document text
    • https://xidokuwu.weebly.com/uploads/1/3/1/4/131453793/9361394.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/jfwpJKu/kaththi_full_movie_in_tamilrockers.pdfIn PDF document text
    • https://fedobakeruja.weebly.com/uploads/1/3/4/3/134367732/napunemosawizit.pdfIn PDF document text
    • https://xuzekivaf.weebly.com/uploads/1/3/1/4/131453918/baluvunet.pdfIn PDF document text
    • https://tifowufiwadoxi.weebly.com/uploads/1/3/4/0/134098290/gafudamupubojo-gasupimata-wabegovetobumo-gudexaras.pdfIn PDF document text
    • http://pekefosijemibi.sportsontheweb.net/gadevebaketemolijazazupa.pdfIn PDF document text
    • http://folejaf.mypressonline.com/kenmore_ultra_wash_quiet_guard_4_dimensions.pdfIn PDF document text
    • https://wujatukeki.weebly.com/uploads/1/3/1/8/131856991/69fc1068eff71f.pdfIn PDF document text
    • http://subuxiwubemew.getenjoyment.net/what_does_straw_man_mean_in_language_arts.pdfIn PDF document text
    • https://cdn.sqhk.co/xixewebirike/fyljjif/1332036845.pdfIn PDF document text
    • https://cdn.sqhk.co/livefivepa/gfjcBfY/appradio_mode_sound_avh.pdfIn PDF document text
    • http://kapabifidi.sportsontheweb.net/fisicoquimica_castellan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a1a6f47-1018-4d86-aa5e-6ebf6f02d4c0/i_am_only_one_call_away_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/402d40e1-d3a4-4b0e-ac09-875fbd4ab4f7/new_england_bees.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/635bef4d-7c88-490b-9c1e-0d3af2f1eb6e/14527038515.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef31a3e2-97a5-49b0-8ec7-13adc7685fd9/starbucks_secret_menu_hot_beverages.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a27af04-8cce-4c6a-8da7-04e0c755b5f4/ruloduxizizoturiluzuvozem.pdfIn PDF document text
    • http://dufojamimusim.atwebpages.com/what_is_the_best_music_maker_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ffffa89-64d3-4bd6-a406-e9d7930a959d/que_son_las_purinas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed1753d5-158b-401d-a60c-6e29c6a30b22/stihl_chainsaw_ms310_chain_size.pdfIn PDF document text
    • http://zisukuvi.atwebpages.com/82493974498.pdfIn PDF document text
    • http://gumusimigogasuz.onlinewebshop.net/internet_payment_system.pdfIn PDF document text
    • http://xotaferuju.myartsonline.com/2008_jeep_jk_rubicon_specs.pdfIn PDF document text
    • http://bexovivuvere.myartsonline.com/pisirofiruwof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c09a7495-aa0d-4ad9-be68-8bfa852f187a/finders_keepers_movie_trailer.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_off0000f21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21C 5352 bytes
SHA-256: a55e1be9291dc98f5db3cc163aea6d125b6f0ebab05812f2fe22de46b6f930ff
font_01_sfnt_off00010483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10483 11200 bytes
SHA-256: 80557fc1888539a246624425d714c84202199bca5625414ef379e5fe09b58dc3

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