Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd4295f161b1600…

MALICIOUS

PDF

76.7 KB Created: 2021-03-14 21:41:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 018352fd3eabe18c14bec9eb89342ea0 SHA-1: 7ae631bce9b39f3f97f6bf3f79fe9053c042c6a7 SHA-256: fcd4295f161b1600f525d1c8cacd60c1dcd2726fe87355f194458f88ce0f2f5a
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to 'resalured.ru', which is likely used to host a phishing page or a second-stage payload. The document body, though heavily obfuscated, contains text related to 'biological half life' and 'wkhtmltopdf', suggesting a potential lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=explain+the+term+biological+half+life
    • http://xuzerujagojagip.scienceontheweb.net/living_clean_cleaners.pdf
    • https://cdn.sqhk.co/mixaluwekitu/xv7jcgf/space_battleship_yamato_model.pdf
    • https://cdn.sqhk.co/walamalesumi/j3che1d/influence_meaning_for_kids.pdf
    • http://lirinevewafa.mypressonline.com/13925265093.pdf
    • http://fiziwafofekaku.mygamesonline.org/91870891092.pdf
    • https://cdn.sqhk.co/fapolokid/hgfgfhc/tijigel.pdf
    • https://cdn.sqhk.co/molivovuki/aPRKigy/2415454239.pdf
    • http://sunufosabupes.scienceontheweb.net/how_to_use_f_keys_on_logitech_keyboard.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/widuxade/parts_for_brother_knitting_machine.pdf
    • http://nojikigor.myartsonline.com/what_are_some_key_features_of_a_commedia_dellarte_performance.pdf
    • https://s3.amazonaws.com/metakibeme/google_sheet_function_sheet_name.pdf
    • https://s3.amazonaws.com/kesumasaka/tobojotibaden.pdf
    • https://s3.amazonaws.com/kumasala/government_nutrition_guidelines_for_schools.pdf
    • https://s3.amazonaws.com/wazotojemov/kanedosobezawasesuxesol.pdf
    • https://s3.amazonaws.com/pasutiz/gavuwedewexur.pdf
    • https://s3.amazonaws.com/memexelu/oitnb_minority_report_cast.pdf
    • https://s3.amazonaws.com/xamibebulosaxug/custom_roms_for_android_5._1.pdf
    • https://s3.amazonaws.com/seriposuj/bulova_marine_star_blue_face.pdf
    • https://s3.amazonaws.com/tuxutedi/deep_down_game_guide.pdf
    • https://s3.amazonaws.com/xoxaneral/28797195767.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_off0000eece.bin
4d272a29bc0d39e198b838552765843b16f2ec8c7be4569a373c0421d93daf5c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEECE 5416 bytes
font_01_sfnt_off0001011d.bin
bbd3e668dc7231e5075ad0bd7f22c6d393046d5ba55ca99ddb579f487fb957d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1011D 10644 bytes