Malicious PDF — malware analysis report

Static analysis result for SHA-256 09c68848037d9b64…

MALICIOUS

PDF

78.4 KB Created: 2021-05-06 02:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 153b607acce2cc7d404927a35618d9dc SHA-1: 5e2e796dd1418e4af8bec64eba9d2ebce1593f45 SHA-256: 09c68848037d9b6442cbf6e5019becb5b224a9154a9417a60320a8737975aa55
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-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/strik?utm_term=are+princeton+review+gre+practice+tests+accurate PDF link annotation
    • https://cdn.sqhk.co/tefebenum/ihRP1hc/94029355507.pdfIn PDF document text
    • http://tavafotuzefox.sportsontheweb.net/astral_projection_guidebook.pdfIn PDF document text
    • https://cdn.sqhk.co/wenewojufaj/bDiawdH/ezpay_solon_schools.pdfIn PDF document text
    • http://zurujavurobe.scienceontheweb.net/written_in_my_own_hearts_blood_audiobook_free.pdfIn PDF document text
    • https://cdn.sqhk.co/musutalivun/rM53hez/jungle_party_flyer_template_free.pdfIn PDF document text
    • https://cdn.sqhk.co/nodujugebi/hhZhblt/blockys_eatery_loveland.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/2969482e-ede8-43da-a1a1-7085ff2203b3/over_the_edge_rpg_kickstarter.pdfIn PDF document text
    • http://jezevenakos.myartsonline.com/what_month_to_plant_tomato_seeds.pdfIn PDF document text
    • http://gegetebipa.atwebpages.com/artificial_intelligence_journal_download.pdfIn PDF document text
    • http://sifebitufol.onlinewebshop.net/how_to_be_a_doctor_in_spain.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/26862329718.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/822fc595-30b6-45ad-b199-404f068d0d52/how_to_download_itunes_music_to_ipod_nano.pdfIn PDF document text
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_5357b026411540f499dd9ffb3bf9e2fc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4010000a-068c-4ce7-82e2-a61ddb2935bd/what_is_a_public_health_administration_degree.pdfIn PDF document text
    • http://piwakitidi.onlinewebshop.net/27066640066.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f43dd10f-c31e-4eeb-aaa0-a96f15e75742/arms_reach_mini_co_sleeper_mattress_dimensions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbacc713-a73d-4e27-9fa0-7f2fb7de34c2/how_to_set_aside_default_judgment.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/itg_mpu_gy-_521_datasheet.pdfIn PDF document text
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_0f0ff68df332411a8e5c20889c6e8055.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF597 5212 bytes
SHA-256: 7da3235bfe699841553253b29a68df78ae6ec66240e753c8b781972c42a8ad18
font_01_sfnt_off0001077f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077F 10644 bytes
SHA-256: 6a3553fcda8af5650d4afb90860d6f347f799a793c30a4fbf375d4bf815f60ab