Malicious PDF — malware analysis report

Static analysis result for SHA-256 20e22a7c34cf7002…

MALICIOUS

PDF

77.5 KB Created: 2021-04-04 07:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fb36d68440874750d2044976c4fb1993 SHA-1: 16a1cf436b8067795d9e9c7b66993e294ade987a SHA-256: 20e22a7c34cf7002215ae9326c7ca3d4b1f0a9303cc667c51c8c6aef2d99461f
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 0.9991

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://mezovuduw.ru/strik?utm_term=how+to+recover+contacts+from+broken+lg+phone PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420468/normal_60563bdb1d2fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459785/normal_5ff0c0edc52e7.pdfIn PDF document text
    • http://wovoradomumakil.medianewsonline.com/schlage_keyless_entry_not_locking.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446770/normal_605ac1e97f6cd.pdfIn PDF document text
    • http://dixunawizodel.iblogger.org/appiani_maneuver.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445737/normal_6021f0b25c58d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470385/normal_601dda33c5bc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427781/normal_6009e22fcf393.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391925/normal_600c21ff42091.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461786/normal_60463336244cf.pdfIn PDF document text
    • http://kevesojesofun.22web.org/present_simple_exercises_online_test.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444643/normal_603e930b2cffd.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/b9d33b76-4fae-4d4b-9ae1-a9f7a1f07b05/88425409216.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a362bc1d-1894-4911-8479-977fb3a0f813/dosojagixotutusuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba51f6d2-1acb-4d61-855c-a7f885de6731/82327350574.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fb21129-8bee-4545-b64e-832267ff4d66/tuwuvulujifadutugukuroseb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cdcc01e-6621-4852-afd0-31d4f2e308ac/harry_potter_and_the_half-blood_prince_movie_explained.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a5e5499-8eba-4f2e-871d-e129ad2969f7/matematica_financiera_interes_simple_exacto_y_ordinario.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28eb2fe9-c9e3-4389-bcbd-d8ed54c1c446/how_to_pair_soundpeats_to_iphone.pdfIn PDF document text
    • http://vigavanoxe.onlinewebshop.net/panasonic_cordless_phone_batteries_ni-mh.pdfIn PDF document text
    • http://sevetise.rf.gd/ruzodibepanubogedapote.pdfIn PDF document text
    • http://lavapokapajemob.myartsonline.com/cutting_edge_pre_intermediate_teacher_s_book_vk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7539f87e-42b1-423b-94bd-5b918999b2bd/wavagan.pdfIn PDF document text
    • http://pomolado.epizy.com/pandoc_templates_location_windows.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_off0000f043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF043 5748 bytes
SHA-256: 41c67e401791e4773b24c6a0bc06c7268bade31e56da4b4cd9a8c7422a9003cb
font_01_sfnt_off000103c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C0 10724 bytes
SHA-256: 32afd7d6e63e45417f72aadea7882cf8d4cf794499476a0fdf50e1c6ae0baf90