Malicious PDF — malware analysis report

Static analysis result for SHA-256 e44e5f92e89e99ea…

MALICIOUS

PDF

87.9 KB Created: 2021-05-04 12:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a31f59775e7c811799cbac459dfe8a90 SHA-1: 4338459e0586d66e194108947ff0acc5da75f50f SHA-256: e44e5f92e89e99ea2960afb7e0154027995c7083a36dac1a0312a46ee9212d2c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://pelibifir.ru/strik?utm_term=how+does+toyota+use+lean+production PDF link annotation
    • http://mobile-media.moscow/how_to_make_a_female_toga_with_fabric2zpsq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426088/normal_6059ac1ec0f95.pdfIn PDF document text
    • http://securityverifiedservices.com/zuwanagurojumobemavew7uo5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482869/normal_606813f792455.pdfIn PDF document text
    • http://mattelipsticks.site/how_to_connect_a_speaker_to_the_tvekf98.pdfIn PDF document text
    • http://tafedudim.22web.org/vesepimofasoxonukatupif.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://s3.amazonaws.com/megulu/92392624998.pdfIn PDF document text
    • http://wajifinome.epizy.com/anganwadi_recruitment_2020_rajasthan_form.pdfIn PDF document text
    • http://zozinidusekoz.epizy.com/what_was_the_main_purpose_of_the_affordable_care_act.pdfIn PDF document text
    • http://fomidazepukiv.rf.gd/86676042527.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a155a50-7a00-4775-b619-2b492a77f25d/32180142340.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/asvab_practice_test_questions.pdfIn PDF document text
    • http://kunesapog.epizy.com/arduino_sensor_shield_v5.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/bagifugi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0faf2a00-27af-4573-bc3a-1fd33df9f749/91303949116.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8F 5104 bytes
SHA-256: 71e68a2d1fbcbfc03834f83bab3819a82f160ff80648a4d1365c180758627ecd
font_01_sfnt_off00011d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0B 11776 bytes
SHA-256: 3c18901d9b197edb75bccb9c88e7b3bd8351e75fca790a28c7bad221d74c5bf7
font_02_sfnt_off00014442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14442 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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