Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a68a5824f3e83b3…

MALICIOUS

PDF

74.5 KB Created: 2021-03-25 09:54:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2eb6360c5c8c4f19e91c70dfb19515b5 SHA-1: 150fe44c028c7c36540dd76b8b0bd67ab59d6457 SHA-256: 4a68a5824f3e83b38060886da64e5c94e737e56b42402f6fed113eaccff8bec4
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 0.9998

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://jottigo.ru/wix?keyword=cell+cycle+quiz+answer+key PDF link annotation
    • http://jigikujed.scienceontheweb.net/hoover_power_scrub_carpet_cleaner_w_spinscrub_technology_fh50135_how_to_use.pdfIn PDF document text
    • http://new-leggins.site/whitfield_pellet_stove_troubleshootingxznvn.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/what_is_better_website_builder_or_wordpress.pdfIn PDF document text
    • http://zahlungsservice-ch.site/71319958131z2u0v.pdfIn PDF document text
    • https://falevuwutote.weebly.com/uploads/1/3/5/3/135301590/vokixew.pdfIn PDF document text
    • https://lejumapufa.weebly.com/uploads/1/3/4/6/134688193/rurofosirorodag.pdfIn PDF document text
    • https://zelidewa.weebly.com/uploads/1/3/4/3/134371532/2800357.pdfIn PDF document text
    • http://svoydvalend.xyz/plants_zombies_heroes_puzzle_partyy44xf.pdfIn PDF document text
    • https://pufabakorulur.weebly.com/uploads/1/3/4/3/134320636/bivalabuzeju_tuvajese.pdfIn PDF document text
    • https://besugadofozoxi.weebly.com/uploads/1/3/5/3/135396803/be5812a2643.pdfIn PDF document text
    • http://leniwatojetojem.medianewsonline.com/41834268533.pdfIn PDF document text
    • http://jotitojimo.mygamesonline.org/anaphylaxis_guidelines_2020.pdfIn PDF document text
    • https://bodokevusigow.weebly.com/uploads/1/3/2/7/132740435/4212539.pdfIn PDF document text
    • https://tamukatiraf.weebly.com/uploads/1/3/4/7/134766395/dewamata-dopej-woxaxojeso-sotixizokodis.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/d6db26f1-9642-4dd2-8fad-f0669bf29c29/41308715344.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef6ac8a4-0874-4889-9a1a-7c587719eb45/40850285928.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dda24ff-2415-4f74-91d3-a498e925b20e/94777179438.pdfIn PDF document text
    • http://rawigukegopafot.onlinewebshop.net/what_is_the_shortcut_key_for_display_properties.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e489e0d-e2d9-4ebb-8067-ccfd7c47b455/elite_gourmet_air_fryer_accessories.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_off0000d0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DE 5132 bytes
SHA-256: 7de450700be79e02939ac1619d88982e442cfd51e9c6d28f682af25600ac6487
font_01_sfnt_off0000e288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE288 10216 bytes
SHA-256: a72c7a6473c3a02fce24175977a0d47f9e75ea30623607489c0f8a615a4ad9c1
font_02_sfnt_off000105b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B1 16144 bytes
SHA-256: c5b81f703ebddc697e6824868dcd306aba919aa4c1ec28f594a83a04df97872b