Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7fa539319bcb2e6…

MALICIOUS

PDF

103.4 KB Created: 2021-04-02 17:33:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: dd4585f41cd1d5278342c49ff9e48c89 SHA-1: cd6fbdb7e60f8630cd53b4db89ddd7f1c5bd1e59 SHA-256: b7fa539319bcb2e6bae4749a870179d05244cb134ac95ba5e3d5ff8c364edc28
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://resalured.ru/award?keyword=application+of+enzymes+in+biotechnology+pdf PDF link annotation
    • https://rabofabi.weebly.com/uploads/1/3/0/8/130813834/didetenekezit.pdfIn PDF document text
    • https://tujezagen.weebly.com/uploads/1/3/4/7/134775207/b26f845387ffd3.pdfIn PDF document text
    • https://sowurudiz.weebly.com/uploads/1/3/1/4/131438308/pilanolufadup.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/eidJZS6/hungry_snake_behavior.pdfIn PDF document text
    • https://senovaxevuka.weebly.com/uploads/1/3/5/3/135304629/kupikeviv.pdfIn PDF document text
    • http://sexurinugu.22web.org/cursive_alphabet_handwriting_sheets.pdfIn PDF document text
    • https://cdn.sqhk.co/wukatigubo/jdZLgeu/gartner_incident_response_retainer.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/8jadjj3/airport_flight_status_delhi.pdfIn PDF document text
    • https://lolutisoxat.weebly.com/uploads/1/3/4/3/134315909/5573585.pdfIn PDF document text
    • https://cdn.sqhk.co/pevipulakas/6Rjd0WA/fisuwoperebafa.pdfIn PDF document text
    • http://gomijojupi.iblogger.org/chemistry_lab_hd_images.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/37007845-e994-4a30-959f-5449cce4ee4d/what_is_reiki_level_1_attunement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ea3d3a1-ad4e-4e1e-bc29-b4e5d5b8f079/what_does_error_3_mean_on_cd_player.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/24119602482.pdfIn PDF document text
    • http://rosodojilu.rf.gd/riwerase.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/free_bejeweled_twist_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/assamese_sad_whatsapp_status_video_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf640bbe-0c8d-4f67-9ffb-5ee2ddf5e938/why_maritime_law.pdfIn PDF document text
    • http://bitediwufekoxem.epizy.com/yakuza_0_chapter_3_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48f0ae9c-b158-4cdd-8327-1fa1185987cb/migamotat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f183158-0126-4ddf-b5b4-e700fa7d46dc/how_to_change_bulb_in_ottlite_makeup_mirror.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/51058472808.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa8d9354-d06b-40de-8182-4a28117c5f95/is_cell_and_molecular_biology_hard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/736c7ce1-f0f1-4352-8a89-e01996b8181b/wumon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4a95bb4-6b0e-4395-a72b-0ae7288df550/zoom_h5_vs_tascam_dr_100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08c9f5e0-f8f3-401f-bd0a-381528336d0d/pezatimoposelalifik.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_off00013e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E29 5752 bytes
SHA-256: 6ca088d42fb466463f78b6be7dfff73b829042a74866e77d867a6a0af40c6131
font_01_sfnt_off000151b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151B4 11712 bytes
SHA-256: 1f446a871d666c3cd25907737947555f9f8ba006721dcc7769f7bb93dc43bc96
font_02_sfnt_off00017a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A0C 16176 bytes
SHA-256: 4808e2ee660a1fc3bb26738d6d87f673efa304ca6f6b314fc9384c08716a6934