Malicious PDF — malware analysis report

Static analysis result for SHA-256 b62df772d0dd8746…

MALICIOUS

PDF

100.4 KB Created: 2021-04-05 19:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 86f964714d8732ea01addba5c8015c39 SHA-1: a4fd56accdb91ecb811f083dd305dec2cd4b3043 SHA-256: b62df772d0dd874628bd7fc2a0d0a7106631a4f8986f574f05bd2808f6774839
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains a lure to copy and paste content into a command-line interface, a common technique for executing malicious commands. The document also functions as a link farm, directing users to external URLs, one of which is a known malicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://midufefew.ru/wix?keyword=dna+cracking+the+code+of+life+answer+key PDF link annotation
    • http://pazujiz.mygamesonline.org/socratic_questioning_strategies.pdfIn PDF document text
    • http://weridif.medianewsonline.com/regions_in_the_philippines.pdfIn PDF document text
    • http://pugisapi.mypressonline.com/44415945557.pdfIn PDF document text
    • http://dumubemajizukov.medianewsonline.com/57347627730.pdfIn PDF document text
    • http://jakesubinosol.scienceontheweb.net/dalaj.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://uploads.strikinglycdn.com/files/c4467b76-a696-4c28-80f1-2ae5b3a77429/rilukilivigazi.pdfIn PDF document text
    • http://sulijugofogim.onlinewebshop.net/air_force_academy_football_stadium.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5c632b5-42c4-4402-acf1-5bb3c5fff445/how_to_program_a_minitor_v_pager.pdfIn PDF document text
    • https://8f1ef4f7-3f23-41ef-a3d6-4e5873a175a2.filesusr.com/ugd/d318ce_747096cd80224ddb9f3a9202ab6f0c4b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9ca6eb9-d195-4433-9f14-9cf4a36f52bd/c_.net_framework_tutorial.pdfIn PDF document text
    • https://fac7854b-22c3-40b9-bef9-ee94a55a010d.filesusr.com/ugd/fba82c_bcaf118fc8f944dca5e8db906c3ce034.pdf?index=trueIn PDF document text
    • http://weponigonimogo.myartsonline.com/chuyn_file_sang_excel_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4313e4db-04c1-422b-aa25-c37dfce4fc9d/dubezide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5bb427c-a453-4527-85f6-f2446682224b/a_concise_introduction_to_logic_13th_edition_answer_key_chapter_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d89e2cb-13dd-4ac3-b6e2-53bf274a53fb/6427659866.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5cf8aa4-bbe7-4def-a264-9d60ca1aa8a2/4451845418.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/663a6df6-3c48-4ea7-93be-76b71e997f3a/32126813316.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38a745d2-97d7-4eae-ab85-d38673492780/ariens_path_pro_snowblower_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6f34741-c9e7-4a4b-b54b-54d4eeba40f8/wsjt_x_2.3.0.pdfIn PDF document text
    • https://5c90cfa9-af55-48e2-9430-1f3580382729.filesusr.com/ugd/e2b09b_ac98d1ffdd5946efa77445da3101f156.pdf?index=trueIn PDF document text
    • http://sajoveguduv.onlinewebshop.net/44057608038.pdfIn PDF document text
    • https://27475d5a-2981-497d-8cd5-0c310ef10f8b.filesusr.com/ugd/9cb927_367aef4642794a5ab0b5189565baf0d2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/88131d60-48b5-49ae-aa32-de26dbc86573/lady_of_the_lake_movie_1946.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03af0027-a395-4f39-8786-8c56960c4076/betitavafa.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13578 2828 bytes
SHA-256: dd7b880f1c6958317b71933e3175eb4154b1281d355b69180e4ce829e506ee21
font_01_sfnt_off00013f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F72 5328 bytes
SHA-256: d29dee2577c03eb73c395b2836219b51e25756ecb4c4b4ea4c433deb68b45ed2
font_02_sfnt_off0001519e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1519E 10532 bytes
SHA-256: c1a776ef0db4e41d7a4744cb1e0d1075d4b4c64c543914ff0c87d9a475bec931
font_03_sfnt_off00017526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17526 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3