Malicious PDF — malware analysis report

Static analysis result for SHA-256 a354f6ad063863b8…

MALICIOUS

PDF

141.0 KB Created: 2021-03-16 21:15:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9e52fadabbbe10b780c1fcb1808a551f SHA-1: b5f87a0d480b7648b90af34ebabe8ab61cc16c2c SHA-256: a354f6ad063863b8565d216cf93125983ee31ddb87be93f0a4499a3bb261b39b
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The 'SE_FAKE_CAPTCHA' heuristic suggests the document displays a fake verification prompt to deceive the user. The presence of numerous external URIs, many on disposable hosting, points towards a phishing or credential harvesting attempt, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://golowaki.ru/123?utm_term=bring+down+synonym+formal PDF link annotation
    • https://cdn.sqhk.co/taxodisilif/eBfggns/8_bit_game_creator_software.pdfIn PDF document text
    • http://repair-telefonov.ru/300_gallon_fish_tank_for_sale_usedv8scp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478968/normal_6004d8a4a65bc.pdfIn PDF document text
    • http://blancop.xyz/how_to_write_a_service_plan_for_clientasq75.pdfIn PDF document text
    • https://cdn.sqhk.co/dubutemaruxu/aghqdxx/zojejevixunu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460072/normal_5fde69f26b427.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366647/normal_6016046a38e34.pdfIn PDF document text
    • http://covidcapsule.world/get_your_guide_iceland_contactmniii.pdfIn PDF document text
    • http://hackins.site/kawesurotitoserofq2jf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471484/normal_5ff8b257491d0.pdfIn PDF document text
    • http://gazzsheff.xyz/vamifitoxilubusiseyj7hx.pdfIn PDF document text
    • https://cdn.sqhk.co/sabimejuka/eTH4hc4/xubaxasemuziliwiberubipo.pdfIn PDF document text
    • https://cdn.sqhk.co/pawekenu/LUjiiio/electronic_music_production_schools_in_canada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485152/normal_604fc4f896c50.pdfIn PDF document text
    • https://cdn.sqhk.co/nasubivapu/gjhcha0/swat_movie_soundtrack_artists.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sajatofubote/why_does_my_washing_machine_make_a_loud_noise_when_spinning.pdfIn PDF document text
    • http://forolulazo.rf.gd/puvuw.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/american_ninja_1_video.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/.pdfIn PDF document text
    • http://laxojidosap.epizy.com/worudodupomoki.pdfIn PDF document text
    • http://pabaxekuvo.rf.gd/dajagi.pdfIn PDF document text
    • http://xolemobubusosi.rf.gd/bijifefemasumuvididafo.pdfIn PDF document text
    • http://nuwudepebepusab.rf.gd/strength_training_anatomy_3.pdfIn PDF document text
    • http://xisomusexiz.rf.gd/vamujusoluwikatikodukuj.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001af98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF98 4440 bytes
SHA-256: 6a14ec79e0f3fa42a008fa46830b38ae3daebc112aae76d249d3fd6697e1e765
font_01_sfnt_off0001bf28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF28 5060 bytes
SHA-256: 8f4c2ae44ab51a50e423b6c877bc96329eb7a31033f7ab2c57ef629909d413d8
font_02_sfnt_off0001d045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D045 15588 bytes
SHA-256: b31e97289ffc3a2775383a55ac566b52d42459b81749f10abd4514932ab9998b
font_03_sfnt_off00020097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20097 16084 bytes
SHA-256: 6d50a6e16b8da756e2d33cf3914ac39ab48eb23c4e46adb1ea8cf5dc518d450c
font_04_sfnt_off00021551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21551 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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