Malicious PDF — malware analysis report

Static analysis result for SHA-256 de642299f9533e6d…

MALICIOUS

PDF

78.3 KB Created: 2021-03-20 03:59:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09a624375abe148804edcb27109a161d SHA-1: d8086275616d538284a2eb1c36f60ddae035be99 SHA-256: de642299f9533e6de016dd164097fe2ca6a7c4343d417662f7010e5c6c016482
126 Risk Score

Malware Insights

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

This PDF document, identified as malicious by ML classifiers and ClamAV, contains numerous embedded URLs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to educational worksheets, likely intended to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://soxebez.ru/123?utm_term=algebra+2+inverse+functions+worksheet+pdf
    • https://static.s123-cdn-static.com/uploads/4422135/normal_6007945b20e68.pdf
    • http://zabavnyi-slon.ru/kekowidakujewodeba68qq3.pdf
    • https://bovatukal.weebly.com/uploads/1/3/0/7/130739183/wopatemawobuvosap.pdf
    • https://sazopugewado.weebly.com/uploads/1/3/1/4/131453094/vimimabudibexudawata.pdf
    • https://cdn-cms.f-static.net/uploads/4475215/normal_5fdad53dad727.pdf
    • http://mexicotop.xyz/gorubagazxnnj.pdf
    • https://resonorur.weebly.com/uploads/1/3/4/8/134874279/livuxe-gewuvasu-gutuzex.pdf
    • http://saveyoutubebot.com/80028131704gsnag.pdf
    • https://static.s123-cdn-static.com/uploads/4374979/normal_6006de6a2c574.pdf
    • http://esclick.pro/74593917620ad86z.pdf
    • http://xxlmature.site/how_to_make_your_own_car_battery_chargerrsxcc.pdf
    • https://static.s123-cdn-static.com/uploads/4413980/normal_5fdd40e52b0c2.pdf
    • http://runexutofo.iblogger.org/predator_generator_8750.pdf
    • https://cdn-cms.f-static.net/uploads/4531523/normal_604cde548f868.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://50fe66f1-00be-429c-ab6c-57a9f80d6ab9.filesusr.com/ugd/39cb9d_425b3173249a4d53a31f58dfd103a1bf.pdf?index=true
    • http://jemadetuv.rf.gd/synonyms_antonyms_homonyms_worksheets.pdf
    • https://uploads.strikinglycdn.com/files/7120e337-cabe-48c5-a832-663e32fdb257/vevamakejoze.pdf
    • https://ba428ff1-d53d-4eb5-bdb2-cc960067f420.filesusr.com/ugd/7041e4_dc06090ea09c47cb97bd5506dcae4cc0.pdf?index=true
    • https://233b4d2f-9c44-4004-b776-098ebc281e6f.filesusr.com/ugd/7f980c_f9e4902415004d3eb0e782e087081529.pdf?index=true
    • https://e29a9437-b0a5-48a6-9afa-908397ce514a.filesusr.com/ugd/16a9c1_22426f39cfe542e7b55748885e316ce9.pdf?index=true
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_8a882fbabcfd464794af940947a5bd04.pdf?index=true
    • http://mulexotuvatago.epizy.com/zowivisibulojekivu.pdf
    • http://xotewewo.rf.gd/first_alert_smoke_alarm_model_9120b_chirping.pdf
    • http://tanorilani.epizy.com/13772274857.pdf
    • https://uploads.strikinglycdn.com/files/cfa51dfe-ee09-4080-b872-f307a585a720/zawakafanigasogurijujub.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1d2.bin
8b8abdef039fcdf6062fe25138e232a7492387be831b988c256d441b7bcd22b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D2 5892 bytes
font_01_sfnt_off000105f5.bin
15022df25a8bbdf28a6b2123e80594b1b69e8c92e1cb3fffea25d6c957a82908		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105F5 11096 bytes

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