Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b657148ccdcf98…

MALICIOUS

PDF

73.9 KB Created: 2021-05-02 22:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f8cd4a4796d1f5ceb57797746efb6e0b SHA-1: e3197e8e7b9da76e69609c3865eacd95db89ca98 SHA-256: 13b657148ccdcf98a50d57779ca10c555749352204cbaa23da07ec5e018cad77
186 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. 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 0.9989

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
  • 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.
  • 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://dafemum.ru/strik?utm_term=infinity+gauntlet+omnibus+reddit PDF link annotation
    • http://my-favshopd.online/woodworking_basics_tools90dg7.pdfIn PDF document text
    • http://respect-ltd.su/airscreen_pro_apk_onhaxssfro.pdfIn PDF document text
    • http://rejasikega.scienceontheweb.net/kujokeme.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/bZpMnwA/rugby_league_2020_fixtures_release_date.pdfIn PDF document text
    • http://it50save.info/mcgraw_hill_chapter_4_practice_test4n025.pdfIn PDF document text
    • https://cdn.sqhk.co/pegiridireva/Qcgi5LQ/nisivowisatoximu.pdfIn PDF document text
    • http://nitafibejuze.mygamesonline.org/basic_computer_knowledge_for_bank_exams.pdfIn PDF document text
    • http://idealica-italy.site/cisco_linksys_e1200_username_and_password57hpz.pdfIn PDF document text
    • https://cdn.sqhk.co/parikozug/hFZWajb/driving_zone_2_mod_apk_an1.pdfIn PDF document text
    • https://cdn.sqhk.co/pidikuso/gjadijE/frontline_commando_2_mod_apk_hack.pdfIn PDF document text
    • http://kijofizovurisos.medianewsonline.com/snt_tc_1a_latest_edition.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.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://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_322b9cf1b139486c9dae93707d03b67a.pdf?index=trueIn PDF document text
    • https://2080fafa-2491-4ac3-8118-a138f33bff34.filesusr.com/ugd/822ecd_59a13aeedb384bad9425483b34e50e86.pdf?index=trueIn PDF document text
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_17c65b14ec6043dc8a077a1b2fa095c5.pdf?index=trueIn PDF document text
    • https://84d655c4-d84a-4a0c-9c32-0387925bd622.filesusr.com/ugd/6233da_bcdfb01df3364f7187b29204e3d56802.pdf?index=trueIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_7f52c77b95f5436bb10519767d79b1c8.pdf?index=trueIn PDF document text
    • http://fowimifefezujo.myartsonline.com/building_technology_1_architecture.pdfIn PDF document text
    • https://e40da922-b0e4-44be-9878-2d4898ccab21.filesusr.com/ugd/3a38e0_b7d790c5dc874ad7bb6449d5e0c00fac.pdf?index=trueIn PDF document text
    • https://413f70bc-0247-4a04-a3fc-eabb14e2b93f.filesusr.com/ugd/f18ee6_6a43bc64618345688ba208b0bc96685b.pdf?index=trueIn PDF document text
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_34e351c084d64836bc5e48e091680ef2.pdf?index=trueIn PDF document text
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_665667e9537e45f7b7b046137eca8783.pdf?index=trueIn PDF document text
    • https://27475d5a-2981-497d-8cd5-0c310ef10f8b.filesusr.com/ugd/9cb927_2ed745cf534a48d98a13555883b2d860.pdf?index=trueIn PDF document text
    • https://d128792e-e0a8-46e0-98ed-b941f5da69b2.filesusr.com/ugd/b98abb_cc306cf0ef9549d49fb44f7edc03a141.pdf?index=trueIn PDF document text
    • https://87b84290-c0b3-4c73-97a1-3d59c64c3f69.filesusr.com/ugd/c638b7_62c19b67a0264a1dbff0662a91dec03a.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_off0000d4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FF 5288 bytes
SHA-256: 3a1b01ef7c60c2f6e22f496f6dff65f2159e6396537e460943f931b798dbd940
font_01_sfnt_off0000e6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DF 10876 bytes
SHA-256: 6575d65bdf746db5738f94226defff15d8f8e3befa0f5f900ddb2d5409ccb708
font_02_sfnt_off00010c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1C 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f