Malicious PDF — malware analysis report

Static analysis result for SHA-256 741fb0caef175bbb…

MALICIOUS

PDF

78.6 KB Created: 2021-04-03 20:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: edfaefeb8458fab47809e0b1d9c67f94 SHA-1: 50f859942c1eaac504cdfde602b379a5e54ec8be SHA-256: 741fb0caef175bbbc31d13aca37570fce577ac262caded1aaa8afdf9c43b055d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to 'seumenha.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is part of a link farm on disposable hosting, a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://seumenha.ru/123?utm_term=what+is+transformation+in+horizontal+gene+transfer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452377/normal_604e1f2337861.pdfIn PDF document text
    • http://servisvds.ru/accu_chek_nano_battery_replacement60i8y.pdfIn PDF document text
    • http://medgaj.com/90390285697wnwe2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367951/normal_605f73b207a43.pdfIn PDF document text
    • http://chategratis.online/safety_performance_evaluation_formncaey.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376849/normal_5fe07d78c801d.pdfIn PDF document text
    • http://vandify.com/how_to_adjust_temperature_on_frigidaire_mini_fridgev4pzb.pdfIn PDF document text
    • http://heleogose.online/78096726225vjavu.pdfIn PDF document text
    • http://brandframeb.com/jewajit9vm1k.pdfIn PDF document text
    • http://prechambre.xyz/hp_elitebook_6930p_windows_10_display_driverssa6xh.pdfIn PDF document text
    • http://keysecret.ru/92836590362jwcu6.pdfIn PDF document text
    • http://study-english-04.space/century_fc_90_welder_reviewx93pm.pdfIn PDF document text
    • http://hangzhoumetal.ru/pasos_para_realizar_un_proyecto_de_investigacion_cientificazvpqa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zaxalamel.rf.gd/59833267648.pdfIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_8f8463799a7c4dc7b0fa4b668e8d412e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/51d26c54-35f0-43ff-ad78-feeb0bba26b3/20455217165.pdfIn PDF document text
    • https://7d33af4c-acfd-4996-9436-348e89828b5b.filesusr.com/ugd/289672_f6b9af64709e4b1f9d05ff9e5671b2b8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/58fd3428-9304-4e8a-9dca-ef4fb278aaba/vipofibabudapodajeforul.pdfIn PDF document text
    • http://mopufeva.epizy.com/71865602455.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8dbd542-b4e9-4f52-aaab-d5ee798ebaa9/vuwogexupen.pdfIn PDF document text
    • https://989244f3-426d-4557-b4f1-0018dac9047c.filesusr.com/ugd/57c819_50d07d84b8b540c08f1005dd7cb5348f.pdf?index=trueIn PDF document text
    • http://gozipoxux.rf.gd/the_pictorial_key_to_the_tarot_by_arthur_edward_waite.pdfIn PDF document text
    • https://065b66ee-25d8-4381-b309-094abc4d823c.filesusr.com/ugd/2703e6_142a83d9bdcd487692652c1b11b30d70.pdf?index=trueIn 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_off0000f3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C7 5244 bytes
SHA-256: 9b140867a839cf97cb4279370fc42a6ddffa2e9a33f73b337bac16c92cdcf8c5
font_01_sfnt_off00010586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10586 10940 bytes
SHA-256: d5884a9418ddea4e1538fc40f3073547010d70597fe72202011a6741d4b26c99

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