Malicious PDF — malware analysis report

Static analysis result for SHA-256 44a553b5fef54cb8…

MALICIOUS

PDF

103.3 KB Created: 2021-04-17 21:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 528706e08b5cb348c2a59eadfad23e9d SHA-1: 0b18c7a86d142897cfb445574ebcf1a2ae630679 SHA-256: 44a553b5fef54cb80c86f2c4047b03367ebe763625fa323587e1572595662ef6
116 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The presence of an external URI pointing to 'zajinet.ru' and a heuristic for 'Callback phishing phone lure' suggest the document's intent is to trick the user into interacting with malicious content or services. No scripts were extracted, but the overall pattern indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://zajinet.ru/strik?utm_term=when+we+collide+lyrics+kd+lang PDF link annotation
    • https://cdn.sqhk.co/serodozire/hihaqVn/bendy_model_mmd.pdfIn PDF document text
    • http://evatopshop.xyz/top_electric_guitar_songs_for_beginnersx5l67.pdfIn PDF document text
    • http://proita.space/1952081195899ytj.pdfIn PDF document text
    • https://cdn.sqhk.co/godezixibufo/3Sgcjj6/program_to_write_notes_on_ipad.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/BqieBO0/photo_keypad_lock_screen.pdfIn PDF document text
    • http://koolmaxt.online/best_linux_distro_for_beginners_2020ky56y.pdfIn PDF document text
    • https://cdn.sqhk.co/gazamara/xekibjc/hit_knock_destroy_tower_defence.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/saganugirojagim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5f81cae-7862-4b25-a5ae-d8a1701255d6/tipuraxi.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/ledakuwibigolodew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/648cef9b-bc31-45af-8857-c4f8531e6c1e/johnson_25_hp_outboard_carburetor_adjustment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dc65530-8139-4dfe-a075-3660739b2f7b/55419545657.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dabadea-50cf-428b-932c-3270f65fdb0e/19467269287.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8757c96c-34f0-43e0-b071-e68aad313ab5/wutixuparosero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0330a884-6b95-47ae-b180-af4c6814a47e/guxuremomupo.pdfIn PDF document text
    • https://s3.amazonaws.com/zowibatev/presto_dualdaddy_deep_fryer_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edc920f4-d9e1-4b59-936a-f4f9afa9b87a/43145278358.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b923da31-5769-4386-a6c3-2bb181fedde4/warriors_dont_cry_chapter_23_summary.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15246 5472 bytes
SHA-256: 8fefaecb7d42c0ae53e503bae44d5b03eff79ac18fbaaff492916239101380bb
font_01_sfnt_off000164fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164FA 12816 bytes
SHA-256: e7c839295b9fe9f829595aaa82cd8f8e5079eff084da13596885764168aff29a

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