Malicious PDF — malware analysis report

Static analysis result for SHA-256 70db3b1af105aea7…

MALICIOUS

PDF

72.4 KB Created: 2021-03-17 20:26:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b156009bf161df780132c5922cce5c34 SHA-1: a6ac1f7c3d85bee1b289ada3920ee936644bdc9b SHA-256: 70db3b1af105aea7173807c4c921b44aa1438b7f97fb7c16e4fab55ce8798265
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 likely used to host or redirect to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. The document body, though heavily obfuscated, suggests a lure related to educational materials to trick users into downloading the payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/award?keyword=grade+3+math+practice+workbook+pdf PDF link annotation
    • http://unreguezff.rest/1789918058sf97k.pdfIn PDF document text
    • https://cdn.sqhk.co/jesupasuzoku/9igs7C6/deity_fallen_apk.pdfIn PDF document text
    • https://mitadelo.weebly.com/uploads/1/3/4/7/134712934/7886041.pdfIn PDF document text
    • http://gabutetidik.22web.org/reducing_improper_fractions_worksheet.pdfIn PDF document text
    • https://zativazu.weebly.com/uploads/1/3/4/5/134586929/640179.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469103/normal_60502ef72fc5b.pdfIn PDF document text
    • https://widosutolitidaf.weebly.com/uploads/1/3/4/8/134847614/1420585.pdfIn PDF document text
    • http://meblik.su/77296908255hdgs3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502439/normal_5ff22bb249c82.pdfIn PDF document text
    • https://cdn.sqhk.co/nivavepe/jgijjPV/pirate_attack_water_table_playgo.pdfIn PDF document text
    • http://cheatyou.site/89688398399t6su1.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/worldwide_cost_of_living_2020_the_economist.pdfIn PDF document text
    • http://netubekebusis.iblogger.org/aggregatibacter_actinomycetemcomitans_review.pdfIn PDF document text
    • https://xofebigile.weebly.com/uploads/1/3/0/7/130739964/janewajabuku_dilagofosenib.pdfIn PDF document text
    • http://kapubasezo.iblogger.org/atc-_guide_belay_rappel_device_video.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/what_are_marketing_strategy_process.pdfIn PDF document text
    • https://jigupeditu.weebly.com/uploads/1/3/1/3/131380623/pufokasanikabufivuxa.pdfIn PDF document text
    • http://gejulavofanutar.mygamesonline.org/guwuwapalodaluser.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gujimosodaza.myartsonline.com/wavekasonawebumezugobemo.pdfIn PDF document text
    • http://kifesafijupesob.onlinewebshop.net/capex_y_opex_en_mineria.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_off0000d9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A6 5676 bytes
SHA-256: 494f65fa9ab38115af725925581c73538a4c54db97cebb33b63c7b0b726d716b
font_01_sfnt_off0000ecdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDF 11228 bytes
SHA-256: b46d654785ee964f597f73fadd739e866611d70f6a777d709d9dc98923975ae7

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