Malicious PDF — malware analysis report

Static analysis result for SHA-256 f26e704a5b1c6600…

MALICIOUS

PDF

100.9 KB Created: 2021-04-02 08:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e1434681dd2251754d8e8504c47ecfa6 SHA-1: 5977ace20d66b6d4ff42a5b52beb581ad2c0e7fb SHA-256: f26e704a5b1c66009f4625f14a7b8ca6a5a70c0a5a1532c57c3ae476daf324c3
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 0.9995

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.
  • 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://bologen.ru/award?keyword=argumenta%25C3%25A7%25C3%25A3o+jur%25C3%25ADdica+pdf PDF link annotation
    • http://izzzaaa.space/blood_bowl_2_trophy_guide61oqb.pdfIn PDF document text
    • http://agreevudb.rest/xetatarubetabazkja8v.pdfIn PDF document text
    • http://spoonnumberone.xyz/cules_son_los_sntomas_de_un_ataque_de_ansiedadc1vel.pdfIn PDF document text
    • https://cdn.sqhk.co/titesojijuko/Qhepxhg/super_pixel_heroes_2019_apk.pdfIn PDF document text
    • http://appletopshop.ru/csgo_commands_for_1v19n941.pdfIn PDF document text
    • http://sehq.xyz/nimawedegopobofepelireruateb7.pdfIn PDF document text
    • http://nat-yoga.space/5621756752stnr0.pdfIn PDF document text
    • https://cdn.sqhk.co/famuxina/hBHMFje/6_infinity_stones_meaning.pdfIn PDF document text
    • http://arnautmebel.ru/how_do_i_use_my_verizon_jetpack_4g_lteey5wg.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://uploads.strikinglycdn.com/files/6bf19f21-d4ea-42ec-a591-a763e5986dbd/by_the_waters_of_babylon_stephen_vincent_benet_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c742de5f-6ba5-4104-a075-46f066eb5f71/somiritumidapedi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7b64fbf-2869-4c8d-a153-2734db2391df/13390912125.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7847686f-4de0-4627-9bfc-320d2d221486/what_is_hermeneutics_and_exegesis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a7bb8d7-8ea6-4c97-ab6a-1c1eec79cffe/jedineteko.pdfIn PDF document text
    • https://a7176590-a44a-43b4-8b25-1171fb6190ac.filesusr.com/ugd/e6ccb8_20c561e6f4e24a38aa27390ffd4d23cb.pdf?index=trueIn PDF document text
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_173737e145434763855ee0281f6ebf6a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2cda80e-6a27-488d-8a54-5163247223d9/paveki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39d8e682-3074-4162-80f8-193558d8a043/kupinuwelopezojog.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BAE 5764 bytes
SHA-256: 9516ec1a1e3e03b7747178f896039d11b9b8ea5db475ec2ee2d56d4e4646ea65
font_01_sfnt_off00014e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E57 13136 bytes
SHA-256: cc9ce544f1b6102e5c58b1cdc9498188aa5a50197ea62b7cd58f8ff08e7904f6
font_02_sfnt_off000175a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175A2 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230