Malicious PDF — malware analysis report

Static analysis result for SHA-256 524c35c69d9bb60c…

MALICIOUS

PDF

117.7 KB Created: 2021-04-03 09:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6e11197e7b6805a4fafceac9411970e3 SHA-1: 5719f2ab2ff25284fc151537b57769d453e98495 SHA-256: 524c35c69d9bb60cbafd953813ceae37e4bc465b12b15cc6af446f862d652916
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 0.9988

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://crophysi.ru/wix?keyword=korean+drama+dubbed+in+khmer+free+video+online PDF link annotation
    • http://idealslim-italiaoficial.site/ocarina_of_time_switch_remaster37a7q.pdfIn PDF document text
    • https://cdn.sqhk.co/dikizumi/ffjaqFi/63763931464.pdfIn PDF document text
    • https://cdn.sqhk.co/mugolino/haTicDb/96494103108.pdfIn PDF document text
    • https://cdn.sqhk.co/dolafita/qnhbjgn/84704846461.pdfIn PDF document text
    • http://blog-millionaire.buzz/22487567385tir94.pdfIn PDF document text
    • http://henrysavbr.site/ti_ba_ii_plus_professional_case67dwg.pdfIn PDF document text
    • https://cdn.sqhk.co/runudori/Zfsgeia/prop_hunt_game_code.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafepel/2bhejjT/mario_kart_guide_wii.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/zusok.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/J7Wlhgv/desert_rider_sandwich_shop_jacksonville_menu.pdfIn PDF document text
    • http://maporirunigis.22web.org/99857369570.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/k5jcr4I/libro_vida_saludable_sep_4_grado.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://67dc9804-4028-4298-afd7-d431d2c16fe6.filesusr.com/ugd/559c84_6284c6a0414e448692063afb4232e8df.pdf?index=trueIn PDF document text
    • http://sizokipizap.rf.gd/7312462518.pdfIn PDF document text
    • http://tubodiluxav.epizy.com/samsung_s9_charging_port_repair_cost_in_india.pdfIn PDF document text
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_a88b1c021b804f4b8d9d1258815aef31.pdf?index=trueIn PDF document text
    • http://ropupifalapoges.atwebpages.com/adobe_after_effects_cs6_shortcut_keys.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.gnu.org/licenses/lgpl.htmlRegularDanhHongIn PDF document text
    • http://www.geocities.com/dnhhngIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12141 5788 bytes
SHA-256: 091b13b802808c2d8c2714fe2c63907d5f2f07059568f970fc86c54b2dd3bb0e
font_01_sfnt_off00013586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13586 5004 bytes
SHA-256: bbd56b4cadcc7630e664826ba8a95e05278e3a74339a34bf404c849f3e9b712d
font_02_sfnt_off00014645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14645 23940 bytes
SHA-256: f813eff136ea7917c854c11000b4f1855af0a740e4dd568314180efe425675b9
font_03_sfnt_off000177a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177A6 12492 bytes
SHA-256: 3f89033b5873f6b15b2d46b93f5b1cc09caed5d198e29cff60f1814aabb969c6
font_04_sfnt_off0001a25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A25C 16096 bytes
SHA-256: 2dff1fc3e5bf1049a512ca2ab3d4448021a5e4676c0c9a63fbc3d390c83797d9
font_05_sfnt_off0001b723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B723 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c