Malicious PDF — malware analysis report

Static analysis result for SHA-256 555a00ef9de0778e…

MALICIOUS

PDF

77.1 KB Created: 2021-03-01 20:43:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 7f4af5b682f5c45c0a85e7a1455b33a6 SHA-1: 6466db886ef9a3bd454f7de7b936b7634622189c SHA-256: 555a00ef9de0778e12a262b30f844e7d7369df1877a1d1a00950e921cd51adbf
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as link farms, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/wix?keyword=army+sift+study+guide+pdf PDF link annotation
    • http://jesofazom.iblogger.org/19422273997.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/tokyo_ghoul_chapter_139_discussion.pdfIn PDF document text
    • http://fajutixosisi.22web.org/tujarakujomelutikodu.pdfIn PDF document text
    • http://jixapijojuxev.iblogger.org/magnavox_dvd_recorder_remote.pdfIn PDF document text
    • http://zugemenelil.medianewsonline.com/child_self_directed_play.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/jiwolerevavosimap.pdfIn PDF document text
    • http://jinapemejasubat.rf.gd/2003_dodge_durango_starting_problems.pdfIn PDF document text
    • http://xanabakawori.epizy.com/fragment_sentences_worksheets_6th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/third_grade_phonics_worksheets.pdfIn PDF document text
    • http://tabunubefuxa.epizy.com/xivisutatiduxatadixirozux.pdfIn PDF document text
    • http://ralakevitodabaj.epizy.com/78849504922.pdfIn PDF document text
    • http://rifoxofome.rf.gd/rejerizoxuwu.pdfIn PDF document text
    • http://sunoxif.rf.gd/82853572785.pdfIn PDF document text
    • http://risuduk.epizy.com/34647553674.pdfIn PDF document text
    • http://gorerigifomof.rf.gd/poraropoxewive.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/as_hablaba_zaratustra_audiolibro.pdfIn PDF document text
    • http://nisetekotixob.myartsonline.com/sewing_machine_patterns_for_beginners_uk.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_off0000f02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02C 5212 bytes
SHA-256: c5469da161b628b63485dc4aacb216bf068ca82ce4ec1494f267a1c543ac6ae2
font_01_sfnt_off000101e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E4 11224 bytes
SHA-256: ee9f2e379cc32dbf5294f318b31cd13ca50435659efd0fa0ebb8df5a1f0c1ef9

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