Malicious PDF — malware analysis report

Static analysis result for SHA-256 3820339418b61b14…

MALICIOUS

PDF

83.0 KB Created: 2021-04-23 03:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 23344da5569cddb0514bfdea4989452d SHA-1: 9f4f11bd2fb2714e84a0c1e4bce42ac5a8016fe7 SHA-256: 3820339418b61b1448964b19641a87d82fa876682a861de45af2b47a9bf90ec5
192 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://yafferge.ru/strik?utm_term=infinix+note+7+64gb+price+in+ghana In PDF document text
    • https://static.s123-cdn-static.com/uploads/4457006/normal_5fc6cc4d7ccf9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446260/normal_5fc85bcf4df5b.pdfIn PDF document text
    • http://uscreditcheck.info/bikolerufaxudefugufumolelcnb1.pdfIn PDF document text
    • http://gufutaca1.xyz/eragon_full_movie_in_hindi_download_300mbmvzlj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425738/normal_5fcd3a4823b41.pdfIn PDF document text
    • http://sallles.ru/e2020_answers_pre_calc4jhdq.pdfIn PDF document text
    • http://sell-toclick.online/fomoremulawamumipopiptgw33.pdfIn PDF document text
    • http://forsage.pw/aliens_colonial_marines_trainer5q4h2.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365539/normal_5ffdefe04f06c.pdfIn PDF document text
    • http://pinerapidsrr.com/xufadoxabuloguxesufo15vdg.pdfIn PDF document text
    • http://itash.space/purple_rose_wallpaper_free_for_mobilebcr8p.pdfIn PDF document text
    • http://redit.fun/tonidiuj9rk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://74f55dc1-c9a5-4be3-8cb6-5a41d2e6c5ca.filesusr.com/ugd/bacb18_d17792914ca0447384d07f6debb5f51b.pdf?index=trueIn PDF document text
    • https://633ee4a5-ef7f-4c35-8c02-ac6c60bc6361.filesusr.com/ugd/0ab374_72648883b45e436681db843bf75a8868.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2816d97d-8302-4c0d-be8b-9bfc38f328a6/vopopuwodomofelir.pdfIn PDF document text
    • https://s3.amazonaws.com/taguxif/who_invented_binomial_system_of_nomenclature_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/arroceria_formentera_madrid.pdfIn PDF document text
    • https://c11ab09e-384c-4904-8c79-5ef6f38008df.filesusr.com/ugd/7131a6_29929a11b45d49afa6f2eeba3ba2ff45.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/539e3f22-699b-4d4d-9af8-991905e6f4b9/how_do_i_set_my_citizen_eco_drive_watch.pdfIn PDF document text
    • https://s3.amazonaws.com/nutanigonu/bumonemewaser.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/45425889346.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e05db15f-dbf6-49df-b141-2ee67b1694bc/genegononuwodagidado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf41e540-5369-4c49-95a1-a084eaba21bb/22162954105.pdfIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_99576b3ed7c0409c87acacdcf23d8c62.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gagotaniwipure/dark_souls_3_interesting_builds.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED28 5536 bytes
SHA-256: 4a74adbb658702d81118d872c3c1c5bf35926cbb186cf0730f4b8d3138e07f54
font_01_sfnt_off0001000f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000F 11824 bytes
SHA-256: 37126b5a667bcec16a91a08c392b9ddebdb8a1f50ce63854f52d1dbacf3dd5db
font_02_sfnt_off000128a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A3 16164 bytes
SHA-256: ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8