Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3328abb7e401e47…

MALICIOUS

PDF

77.4 KB Created: 2021-04-01 20:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d323aec02e8ce3f3ce9be41a6271dbd5 SHA-1: 19af489968637eca275d820ff8016115889071fc SHA-256: a3328abb7e401e471f73cff080c91067043e35d05fa061cc62205c866296d7ba
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://maypoin.ru/wix?keyword=realidades+2+guided+practice+answers PDF link annotation
    • https://cdn.sqhk.co/sejujona/djighid/wolad.pdfIn PDF document text
    • http://xopaberowiwin.getenjoyment.net/registro_anecdotico_psicologia.pdfIn PDF document text
    • https://cdn.sqhk.co/kadeposamo/PgjXqyq/jamaica_radio_station_rjr_94_fm.pdfIn PDF document text
    • http://about-fb-support.com/remesozikulilobufo6qv4.pdfIn PDF document text
    • http://fadulifakibul.medianewsonline.com/behavioural_management_theory.pdfIn PDF document text
    • http://temilops.xyz/stand_by_me_movie_songzrqkb.pdfIn PDF document text
    • http://mukinokelek.mygamesonline.org/69084800168.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/jdghHjb/wifukedugojilefukefa.pdfIn PDF document text
    • http://xemokajoled.medianewsonline.com/86157988915.pdfIn PDF document text
    • http://redirerer.medianewsonline.com/trabajo_adiabatico.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxofalu/bgermJD/warplanes_ww2_dogfight_all_planes_unlocked.pdfIn PDF document text
    • http://lotibamuzuti.scienceontheweb.net/lean_6_sigma_training_online.pdfIn PDF document text
    • http://supusatode.sportsontheweb.net/advertising_agency_profile.pdfIn PDF document text
    • http://g00y.xyz/tomanozokajilafusigonadkx07o.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/228cb5d4-a1a1-4575-b652-de4b55c9529c/d-link_dir-615_firmware_upgrade_instructions.pdfIn PDF document text
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_b5d3dc143b864f56aec24c7f886e9701.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b988393f-6e0d-4917-b376-e23bac92f032/how_do_you_use_audacity_step_by_step.pdfIn PDF document text
    • http://doriponesarom.myartsonline.com/the_very_greedy_bee_story.pdfIn PDF document text
    • http://sodowurivav.onlinewebshop.net/americanismo_e_fordismo_gramsci.pdfIn PDF document text
    • https://5e024257-ca51-40df-b6b5-a3104c7b7124.filesusr.com/ugd/97368a_ce8899799dba4944b21de51cd99e4385.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE512 2900 bytes
SHA-256: 68d094faf81d2ea9f62e68ee4e789e40b6192f27e323b9e50c58fbaa8f881837
font_01_sfnt_off0000ef55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF55 5472 bytes
SHA-256: 60f81c65f8cf36804c2f973b5ff723f25200c35cda0c59ecede5e5f9bd503418
font_02_sfnt_off00010219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10219 10508 bytes
SHA-256: c5a3769143c9ee6bc3673cd9f6e2faed07f6f81deaaa28d6d74ee5e7a82fad80

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