Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b12f4b2b51106d…

MALICIOUS

PDF

77.3 KB Created: 2021-03-05 11:03:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 8e2b05cf0ae6af35b28ea5980b403bec SHA-1: 2a66184e9585122c20f8ba0ce360dd4326273eaa SHA-256: 19b12f4b2b51106d12109b877435b3d3c22fa5a6eab272ab6d52dfa86f6e6691
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple external URIs and is flagged by a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The presence of a 'download button' heuristic and numerous links suggests a lure to a malicious website, likely for phishing or malware distribution. No scripts were extracted, but the overall structure and heuristics point to a malicious document designed to trick users into navigating to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wb?keyword=make%20the%20road%20by%20walking%20quote PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366382/normal_603d111f6d6d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489414/normal_5fcbc6f58924d.pdfIn PDF document text
    • http://buloshnaya.site/old_bridge_middle_school_parent_portalsc75m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420239/normal_5fd2eef1a30ee.pdfIn PDF document text
    • https://cdn.sqhk.co/letareximo/hmCRxgj/42667309399.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408599/normal_5fe9572d8af6f.pdfIn PDF document text
    • http://forexgeeks.net/paint_blaster_game08prn.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/ghhiab0/kisefuza.pdfIn PDF document text
    • http://glossywp.online/wuwisidi5oui0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372721/normal_5fdff5113e98d.pdfIn PDF document text
    • https://cdn.sqhk.co/bogabixexuja/Egehajd/23516190247.pdfIn PDF document text
    • http://trujillostacoshop.com/romeo_and_juliet_vocabulary_act_1_scene_3pykdp.pdfIn PDF document text
    • https://cdn.sqhk.co/zapiseniw/gdfrYgh/arena_stage_dc_calendar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381762/normal_5fdba8f509314.pdfIn PDF document text
    • http://afracheat2.xyz/cobra_200_gtl_dx_reviewhc0bs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412377/normal_5feea4f3ae57e.pdfIn PDF document text
    • https://cdn.sqhk.co/xupumekejaxa/heSxiiN/safest_cities_near_chattanooga_tn.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/d2d44836-a0d1-40b8-8aee-b09ade9aeecf/67449186986.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/millennium_bcp_empresas_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/divokekajoparo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1891b17d-0160-4625-ae33-b1d71dea637f/scala_rider_g4_review.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/voganububidu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1312e469-d42a-492e-9967-99424f604a52/creative_writing_workshop_ideas_for_adults.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/building_construction_lecture_notes.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF185 5436 bytes
SHA-256: ec96b1544828c524ce8684d0fcbb08fd6dea5abd78e4659ff54a40342ead7e4b
font_01_sfnt_off00010416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10416 10708 bytes
SHA-256: 7bd931897fb610a0195da66c0117494d7c0008c6394ef785b21af6f3e7ae1c52