Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b71f5b15ed79695…

MALICIOUS

PDF

83.0 KB Created: 2021-03-15 14:41:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98391ce048976c6ad7718d69de4d2267 SHA-1: e88fe29e90728aca89070157f2a0b782ab7e02cf SHA-256: 5b71f5b15ed796957bedd68c5aa90190fd90e0e6a2c3572b9170f404991b739b
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by heuristics and a machine learning classifier as malicious. The ClamAV detection further confirms its malicious nature. The document body, though heavily obfuscated, suggests a lure related to 'equivalent fractions practice pdf', which is likely a pretext to direct the user to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/award?keyword=equivalent+fractions+practice+pdf
    • https://cdn-cms.f-static.net/uploads/4382186/normal_6035be9323960.pdf
    • http://ridunculus.com/ds212_oscilloscope_manualc3nob.pdf
    • https://cdn-cms.f-static.net/uploads/4405202/normal_5fe813a720de1.pdf
    • http://normab-id.com/87161772418u5f82.pdf
    • http://jifarobajis.sportsontheweb.net/70332055201.pdf
    • https://cdn.sqhk.co/wodaximewule/ghjdshg/why_do_bombas_socks_cost_so_much.pdf
    • http://hookup756.fun/94996647900w4yo8.pdf
    • http://vetobiz.sportsontheweb.net/karubukajewatenexixoj.pdf
    • http://podarokinsta365.site/30406388422jre7z.pdf
    • https://cdn.sqhk.co/satukevaguka/pgjiept/buxawopuvoz.pdf
    • https://cdn.sqhk.co/jawezumate/C1djeJa/game_buried_town_mod_apk.pdf
    • https://static.s123-cdn-static.com/uploads/4471250/normal_60038145a07a7.pdf
    • http://sifisomatexow.sportsontheweb.net/bodalotolezuzaxoduz.pdf
    • https://static.s123-cdn-static.com/uploads/4480736/normal_5ff5d5e10fab1.pdf
    • http://fogejebimo.scienceontheweb.net/cephalocaudal_principle.pdf
    • https://cdn.sqhk.co/mojikeke/cA1P7ia/rilegonufizufaw.pdf
    • http://health-top.ru/gitejotitorunesupidikohbe22.pdf
    • https://cdn.sqhk.co/suxepemup/ijgc9RK/kumajukonar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_0de21252aca14d69a45499f505748513.pdf?index=true
    • https://s3.amazonaws.com/mubemutolewe/the_art_of_manipulation_omar_johnson_free.pdf
    • https://s3.amazonaws.com/luworizesupox/free_energy_pogil_answer_key.pdf
    • https://s3.amazonaws.com/nezanurugega/pibiviretewadowawawirez.pdf
    • https://s3.amazonaws.com/desenaz/azhage_azhage_song_ringtone.pdf
    • https://9e0ebcba-7e04-41ac-afc6-cfc574163c15.filesusr.com/ugd/6725b5_32430e4378e84cd887bec02c7048c390.pdf?index=true
    • https://s3.amazonaws.com/gozilum/aurora_hdr_2019_free_fullversionforever._com.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9ea.bin
101e6d8ac9f55d636a05dbfca1a107ce2afb9fae7024920f61a55aca3e936490		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EA 5292 bytes
font_01_sfnt_off0000fc05.bin
868d829858f10c410a494f6d69ab136e93b14bdbeebef52c4ed9e50f19bd9997		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC05 11848 bytes
font_02_sfnt_off000124f6.bin
6b2bb4b650513f9a307a70ae1230ad8c0eedc0510a96963a0224e05bd0dc2ed0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124F6 17412 bytes

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