Malicious PDF — malware analysis report

Static analysis result for SHA-256 310ef9cc387f2111…

MALICIOUS

PDF

81.6 KB Created: 2021-04-24 21:19:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 51415f1560a9823eb94efbf0dad1586e SHA-1: 79c4c98672d20058caeda79c2bcb95ffedb62358 SHA-256: 310ef9cc387f2111c845d143eab34513a6d7cd4be360414bf780773aba0e8e74
196 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector URL, indicating a phishing or malicious download attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains metadata related to PDF generation and a BMW maintenance schedule, likely used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?utm_term=2015+bmw+x3+xdrive28i+maintenance+schedule PDF link annotation
    • http://o-karte-kopilka.com/mainstays_twin_over_twin_wood_bunk_bed_assembly_instructions6hjmn.pdfIn PDF document text
    • http://academic-club.ru/acls_study_guidexce7o.pdfIn PDF document text
    • http://dfahsdfgjsfg.online/securus_contact_informationglhcd.pdfIn PDF document text
    • https://ravemazezaj.weebly.com/uploads/1/3/4/8/134885195/baxakixoteno.pdfIn PDF document text
    • http://lamovingcompany.com/kexabalulowepubam0k6l.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/eMay5gV/78893284987.pdfIn PDF document text
    • https://cdn.sqhk.co/nudekikusefi/jghbhbX/wufezawutufad.pdfIn PDF document text
    • https://gewewipuno.weebly.com/uploads/1/3/0/7/130775766/c8360134d498.pdfIn PDF document text
    • http://lnstagaram-verifiedbadges-from.com/winidoratesubit0jbq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://989eff4c-946f-4221-9817-1a8d60f2082d.filesusr.com/ugd/7edf14_557fa5c5306642c58c583a5d70838071.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/ca_dmv_abandoned_vehicle_form.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/arcade_games_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/urine_c_e_test_report.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/what_is_juvenile_justice_system_in_the_philippines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae4a10b2-3b01-4865-addd-cf8bc71b999b/motorola_talkabout_t465_manual.pdfIn PDF document text
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_6a99e73b00c94ae1888870bcbb9e0ea2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfaff777-d5ef-4245-b859-e4c8059cef9e/51643437945.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/652589e7-a080-4e23-b377-07adba606819/werewolf_the_apocalypse_totem_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36b622da-19c6-415a-b6bb-b8b5be7abab3/ravupisavam.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/black_desert_online_for_mac.pdfIn PDF document text
    • https://662517ce-f374-4037-aebd-99b1dbe00103.filesusr.com/ugd/0c4177_c06e845816714aca9eab597434d3aea0.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_off0000ffd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD7 6252 bytes
SHA-256: d7cc0c339dc781b05d896a48ca6f1016c90ac7b8f3922231d0422f43faa063a5
font_01_sfnt_off0001150b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150B 10384 bytes
SHA-256: 8c8138e0ec0a5b136fd198fec674b281a60a30bf3b8c72a6ea7f50c1c5c683f1