Malicious PDF — malware analysis report

Static analysis result for SHA-256 f19e56b8cfbc0d3f…

MALICIOUS

PDF

77.1 KB Created: 2021-03-14 13:18:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16f0bab50ac750f4086b67c4cae8f207 SHA-1: 7e643915f3509970e529bdf6a26134ea3c913ba4 SHA-256: f19e56b8cfbc0d3fa6f022af5e061e6db49f4d36956468ef63221f5be26d9866
96 Risk Score

Malware Insights

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

The PDF file contains a lure related to servicing a gas heater, which is a common social engineering tactic. It embeds external URIs, with the primary one being 'https://resalured.ru/strik?utm_term=how+to+service+a+gas+heater', likely leading to a phishing or malware download site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/strik?utm_term=how+to+service+a+gas+heater
    • https://cdn.sqhk.co/kubepugemaki/gdGqpjb/dungeon_keeper_2.pdf
    • http://fejiximodanu.mygamesonline.org/bluedio_t2_plus_turbine_wireless_bluetooth_headphones.pdf
    • http://sarelalitodidi.66ghz.com/31-_derful_card_game_answer.pdf
    • https://cdn.sqhk.co/kapideto/dI3NvGx/ultimate_racing_history_riverside.pdf
    • http://lojapidabud.mypressonline.com/ahlan_wa_sahlan_textbook_audio.pdf
    • http://lixorajepidil.mygamesonline.org/what_is_a_battery_float_charger.pdf
    • https://cdn.sqhk.co/sorubajuzoxe/ikfsjem/22748213823.pdf
    • https://cdn.sqhk.co/xoxapivasif/Iig1icw/that_s_you_song.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/genedonapubefe/gre_prep_practice_questions.pdf
    • http://fonedasin.epizy.com/radupetalasesemarijope.pdf
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_1777267c32684afb9c3e8a9ad13bddbf.pdf?index=true
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_1c148d10c87d46a0bac85486a2020937.pdf?index=true
    • https://s3.amazonaws.com/regufojalojaza/what_are_the_elements_of_drama_prose_and_poetry.pdf
    • http://vagasobewinepu.rf.gd/daily_use_english_words_with_meaning_in_punjabi.pdf
    • https://s3.amazonaws.com/waxegatulo/xefavupematuralabeb.pdf
    • http://namepafubi.atwebpages.com/sejozuboramifiluladi.pdf
    • https://s3.amazonaws.com/tesotiwapax/link_s_awakening_guide_level_5.pdf
    • http://tapoloferazuziw.atwebpages.com/d_d_5e_acquisitions_incorporated_free.pdf
    • https://33edd578-4186-4695-89f3-f56a5a23fc53.filesusr.com/ugd/f17c08_53683686b39848a791cc5262f9258d58.pdf?index=true
    • https://46b09160-81f9-4cb3-9cca-f7b5b0c0229e.filesusr.com/ugd/179cc6_cd6d0e7a3be74862b74a1191f54cbbb7.pdf?index=true
    • https://s3.amazonaws.com/midizaxopazeji/41239100216.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_off0000f036.bin
2c6dd59ead05e1435fc6e04eea1ee7237cfa5fac91429f8b876e1e5989d67f00		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF036 5144 bytes
font_01_sfnt_off000101c7.bin
576686ab19f98c6be4975687f0cb0fc670d1fb90c461c31a98788b822131325a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101C7 10924 bytes

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