Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a2778b16c81d5b0…

MALICIOUS

PDF

80.4 KB Created: 2021-04-02 16:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 74f7588d43a8a58b3e3e827ed2937fda SHA-1: a2bd7444c9686a03f7f6261ec29c6de204959349 SHA-256: 8a2778b16c81d5b0e073854627b1a0c1c7668ddcc5c787992cbf8ca0e11ce690
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://mezovuduw.ru/wix?keyword=surface+area+of+composite+figures+worksheet PDF link annotation
    • http://wutigesekigaj.22web.org/13286408497.pdfIn PDF document text
    • http://mopewogubit.getenjoyment.net/epispadias_pediatria.pdfIn PDF document text
    • http://helplnstagramcontact6088757.com/what_is_the_vrio_analysisagxxp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452846/normal_5fe48e3d232cf.pdfIn PDF document text
    • http://characduwe.space/benzoylation_of_aniline_experimentkjset.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413242/normal_60494892c74f3.pdfIn PDF document text
    • http://uspex22.online/ap_stylebook_55th_editionnbief.pdfIn PDF document text
    • http://jawixogu.mygamesonline.org/de_que_se_trata_la_obra_iliada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479460/normal_6041a24c01c6c.pdfIn PDF document text
    • http://gativatur.getenjoyment.net/21563127953.pdfIn PDF document text
    • http://fuvidevifa.scienceontheweb.net/77995840152.pdfIn PDF document text
    • http://wimudevereru.sportsontheweb.net/56881024235.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://smartradiobf.ru/weber_kettle_grill_replacement_partsl1pgp.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
    • http://gokonef.epizy.com/lowetojatixebusosope.pdfIn PDF document text
    • http://gokojap.epizy.com/perfect_progressive_tense_worksheet_with_answers.pdfIn PDF document text
    • http://soxuxemakim.rf.gd/50422516742.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/zokibu.pdfIn PDF document text
    • http://witopovuketoj.epizy.com/86171374235.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/bike_stunt_master_game_apk.pdfIn PDF document text
    • http://wonetone.rf.gd/flight_of_the_bumblebee_sax_alto.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/53759645590.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_off0000ed3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3A 5432 bytes
SHA-256: 8e4401541f7ebafa99c140328a287f146ae80a0e7d9c350f5488a85e94ba9e7f
font_01_sfnt_off0000ffc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC6 11292 bytes
SHA-256: e31abf4920e1434b746d9925cc061d491f76878565969ab22590c9aa0a1ac5c1
font_02_sfnt_off000125f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F6 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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