Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd12da6605d28e32…

MALICIOUS

PDF

103.9 KB Created: 2021-03-14 03:13:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ff4100c1b984ad93b89a3fc9bb246116 SHA-1: b0000eb7d8925a06a1f5f3d8ef80ad89d3ce8c32 SHA-256: dd12da6605d28e3263f10b189c0f8462fabc9cf1b350a213c1429d750380012c
126 Risk Score

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 0.9994

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://druttle.ru/award?keyword=anandamela+pujabarshiki+2020+pdf+free PDF link annotation
    • http://m-laskin.ru/8051_assembler_directives9mbbm.pdfIn PDF document text
    • http://mumopajikex.mygamesonline.org/86378227721.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387244/normal_5ff9bf25052aa.pdfIn PDF document text
    • http://jawixogu.mygamesonline.org/37337529965.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379856/normal_5fca4e5dac6de.pdfIn PDF document text
    • http://triple-doska6.club/40577760222vlsmc.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/vifexalusomegezobugume.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427781/normal_602f2a8107525.pdfIn PDF document text
    • http://pifedalune.medianewsonline.com/40728615913.pdfIn PDF document text
    • http://fuvesozufinefi.medianewsonline.com/50077564430.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/3a61c2b2-cff5-4c8e-8fd6-b7989a3e14d1/pinigipuxuzamiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a9baa48-df3a-4024-91be-0cf7058c3122/81094660116.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb68b1ff-7799-44be-9f58-38072fc20872/25341843223.pdfIn PDF document text
    • http://sulorowanutabu.atwebpages.com/74311825106.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aaac5bd-17e1-4dd8-bd38-9cb0b17e775f/what_is_concrete_cover_for_reinforcement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4045c03a-0c41-4a03-a16f-b287e875af85/luxawofob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/854d24ec-2103-4bc6-898e-4af03897bc26/midland_75-822_dash_mount.pdfIn PDF document text
    • http://gakamaxoluzes.atwebpages.com/89599575712.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bda08f5b-ed40-43e5-96dc-e05450a76da2/99890979419.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8437408c-013f-4407-9761-0a8897464e63/3775983589.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C45 5824 bytes
SHA-256: 72e5655e4d1f38d76c14a109ab218316c90266c93f1617ad181c34a7a0ef84c9
font_01_sfnt_off00012fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE4 11064 bytes
SHA-256: 53be71b2849d08fa939cb8cf7acf983fbdae140ef1c8fa19599805d12126d8e5
font_02_sfnt_off00015407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15407 11736 bytes
SHA-256: 08573266aa2c5feb8a55d518fd9bb9328378aa3f0e63d521964c8d853165fac5
font_03_sfnt_off00017c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C47 16164 bytes
SHA-256: ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8