Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb85c0da575d4f9…

MALICIOUS

PDF

80.0 KB Created: 2021-02-27 03:01:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4bf9838305a654a00e695349feb5235 SHA-1: 7a6f47590c856bdab23707ed2aa9286f9a7610cc SHA-256: cfb85c0da575d4f9e8ac3181d0c5d35f6fbeebc5c0675d8f24fdc361d524b1a6
96 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating an external URI and is flagged by a machine learning classifier and ClamAV as malicious. The embedded content, though heavily obfuscated, appears to be a lure related to furnace maintenance, directing the user to the malicious URL https://nipisod.ru/strik. This suggests a phishing attempt to redirect users to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=how+to+test+the+flame+sensor+on+a+furnace
    • https://cdn.sqhk.co/suvezadamut/Jsjhgcu/volta_charging_headquarters.pdf
    • http://pefiworawodud.mypressonline.com/words_that_start_with_koa.pdf
    • http://sepoxudozixo.sportsontheweb.net/classical_guitar_hand_exercises.pdf
    • http://falorilipeb.mywebcommunity.org/7399552202.pdf
    • http://davupopebuwiser.sportsontheweb.net/how_long_have_jails_existed.pdf
    • http://jekenufakewe.mypressonline.com/pafedonizozudatusovamoka.pdf
    • http://befotuke.mywebcommunity.org/what_does_being_a_submissive_woman_mean.pdf
    • http://nijalatol.mypressonline.com/thrustmaster_t-flight_hotas_x_flight_stick_ps4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/wixanarer/wetatoxemomegorupodob.pdf
    • https://s3.amazonaws.com/vatosolikijike/bovine_viral_diarrhea_merck_veterinary_manual.pdf
    • http://jabejanaboz.atwebpages.com/50675636152.pdf
    • http://nukilaba.myartsonline.com/38438118553.pdf
    • https://s3.amazonaws.com/gaxuremewuger/pesoboxupuzasojivujanu.pdf
    • https://s3.amazonaws.com/limepusotanal/b._ed_exam_form_2019_mjpru.pdf
    • http://tuwutexo.onlinewebshop.net/what_is_hardware_short_definition.pdf
    • http://vorisenunajix.myartsonline.com/gubazuliba.pdf
    • http://zevusup.atwebpages.com/87573959495.pdf
    • https://s3.amazonaws.com/natewared/widagekim.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efad.bin
ea438877f807973045dc5a810c2e3c17e4b370ed6f596572b4269bad7b52610a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAD 5008 bytes
font_01_sfnt_off0001009c.bin
2a38c47c5b580f1a79a544e142a53b5d70d9ccccf29bc18dd88409a9d274ceb0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1009C 10540 bytes
font_02_sfnt_off000124a1.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x124A1 4324 bytes