Malicious PDF — malware analysis report

Static analysis result for SHA-256 b35993238d30f929…

MALICIOUS

PDF

100.6 KB Created: 2021-03-18 14:15:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b1ac07dc56669004299d2271b922144d SHA-1: b068ce980fbff3999dec2ee4c7a7c6b0b8161a8c SHA-256: b35993238d30f92991a9682f8573ec37d08bb784b0cd5a549946111b33704efe
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, with one prominent URL pointing to 'jacksth.ru' and another to 'flowerport.market', suggesting a link farm or redirection mechanism. The presence of these URLs and the overall detection indicate an attempt to direct the user to malicious content.

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://jacksth.ru/aws?utm_term=what+is+the+social+contract+theory+of+the+origin+of+the+state PDF link annotation
    • http://flowerport.market/stickman_world_warbfftz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488842/normal_6034c02783008.pdfIn PDF document text
    • http://stopnutristrike.ru/100154803801ju3a.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/hhjdhid/43068504625.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458824/normal_6046c5b8998e5.pdfIn PDF document text
    • https://cdn.sqhk.co/jesupasuzoku/pkqWhak/piggy_bank_money_clicker_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/jbfwhf8/business_plan_examples_for_small_businesses.pdfIn PDF document text
    • http://polfact.site/amendment_to_listing_agreement_form_240innr0.pdfIn PDF document text
    • http://top-odejda.com/xixifoxibq5qj.pdfIn PDF document text
    • http://mamajan.space/seamless_understanding_the_bible_as_one_complete_story6vg0s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457008/normal_5fce07b23e562.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452157/normal_5fc7e3c78d7ba.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/Bja8hi5/negobazop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462681/normal_5fe8d4cba8e1e.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/88b19a26-f5b5-4dd1-98d4-a7c08b859bd9/what_does_it_mean_when_a_gfci_is_blinking_red.pdfIn PDF document text
    • https://5c06e36d-e6a7-492f-989e-88f86e9ca1b1.filesusr.com/ugd/c9ae65_4ef64e45738f4ce0912753ddbb9e1f13.pdf?index=trueIn PDF document text
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_1dc03aae271b42a6abe5e4bc6b56adf5.pdf?index=trueIn PDF document text
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_0f2bf403126f4caca0e58647d899ca9e.pdf?index=trueIn PDF document text
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_179ef0fb6d3d4effb296ee85dfb98c76.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d550eab-641b-4e00-be60-6d21b467887e/what_is_the_ethernet_port_on_my_xfinity_cable_box_for.pdfIn PDF document text
    • https://4095172d-bd2f-4181-91d7-dd424e653400.filesusr.com/ugd/df73ab_aa8c1882ba1447a8a2f31a4d22440b50.pdf?index=trueIn 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_off00014c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C5D 5256 bytes
SHA-256: f8dc386aa65fd0cd2e1e1b58d5b637a34d124aeccbcd5f39ad301da3304c28d0
font_01_sfnt_off00015e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E53 11860 bytes
SHA-256: db36ecdee689c8394272cc8ff016c90dfc96adabc53c8a7f4bd02c1ab35ef3d3

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