Malicious PDF — malware analysis report

Static analysis result for SHA-256 2708f157bc6a31cc…

MALICIOUS

PDF

72.8 KB Created: 2021-03-17 01:26:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 8bf07579eed05c9279f3eb5927c4b5fb SHA-1: 4afa87f79792ee3ab92352816a07ef039b4ba0dc SHA-256: 2708f157bc6a31cccd2ae9d8273dd51aa4e585c145d47757fd2a7ae8b4478173
126 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous external links, many of which point to disposable domains and are likely part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://leonvi.ru/123?utm_term=english+literature+reader+class+10+question+answers PDF link annotation
    • http://betijeduw.getenjoyment.net/dd_class_personality_test.pdfIn PDF document text
    • http://gakagebir.mypressonline.com/price_of_lexus_gx_460_in_nigeria.pdfIn PDF document text
    • http://fudasoba.iblogger.org/wusemaxabaxe.pdfIn PDF document text
    • http://boribonabone.mypressonline.com/non_parametric_test_in_spss.pdfIn PDF document text
    • http://tapozifokun.mywebcommunity.org/jitogexedepon.pdfIn PDF document text
    • http://sowopezamiw.medianewsonline.com/pepabexofi.pdfIn PDF document text
    • http://zebozewazogaso.scienceontheweb.net/cephalometric_analysis_for_orthognathic_surgery.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fataragoreb.myartsonline.com/optiplex_7010_driver_cab_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/30474833496.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0be21825-7491-4bc0-8525-d5d48c440fa0/72623477238.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fb17983-57d8-4634-b146-326d6d11a7a3/how_to_activate_mifi_8800l.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0805d498-2cf7-4d4d-bca3-5d2baabeb5c6/the_knife_of_never_letting_go.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/rorafuvupulam.pdfIn PDF document text
    • http://pexevogawi.epizy.com/vebosoraredezo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ae6d4fd-908f-4aae-adec-266aee084f45/nejuwis.pdfIn PDF document text
    • http://xomapagovujux.atwebpages.com/what_are_some_fun_quiz_questions_to_the_impossible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c107be8c-25e0-48b8-97af-40723f2d2f6a/jonabefivojinire.pdfIn PDF document text
    • http://xofunuxemijowex.rf.gd/banking_services_chronicle_current_affairs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10affd55-c783-4158-89b3-8be095f4cb42/77737370703.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aca073e0-3bc4-423f-b9f7-102c7796d23a/que_significa_el_titulo_rebuilt.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/bimutog.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_off0000de41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE41 5572 bytes
SHA-256: 9c7fa3845156134cc13ec2981800a3265ee6d1ebc1c295c1c504cfc18224b057
font_01_sfnt_off0000f139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF139 10668 bytes
SHA-256: 458e5b55b0d66a585fb5fdd16eff493cd736fc16642135aefa7dab6b12dcfc0f

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