Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca6e1ab22bd6489…

MALICIOUS

PDF

188.0 KB Created: 2021-01-23 07:14:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 398bf051523bf896a14a3ee47064d5bc SHA-1: ebd657035793e2dc677efa0e3d6e091604c3150f SHA-256: aca6e1ab22bd6489fc7636dd165fa990196ce906831fc87388d9db2c8f227a56
116 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or callback scam. The SE_CALLBACK_LURE heuristic directly indicates the document's intent to trick users into calling a phone number. While no scripts were extracted, the presence of external URLs suggests a potential download or redirection mechanism. The document body is heavily obfuscated and unreadable, providing no direct textual clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffine.ru/123?utm_term=arm%2527s+reach+co+sleeper+mini+sheets PDF link annotation
    • https://cdn.sqhk.co/zudusidesu/QhfSpjj/54649014656.pdfIn PDF document text
    • https://cdn.sqhk.co/kurinunuwor/fjeib63/35393597836.pdfIn PDF document text
    • https://cdn.sqhk.co/guzunilepin/hhgN1Ws/takixipefabewari.pdfIn PDF document text
    • https://cdn.sqhk.co/bozutebux/iegdhgm/2020_college_football_schedule_excel_spreadsheet.pdfIn PDF document text
    • https://cdn.sqhk.co/juzurupivepo/Iiec2ha/apple_iphone_wallpaper_hd_full_screen.pdfIn PDF document text
    • https://cdn.sqhk.co/mowanideju/ceYhbGn/86947465004.pdfIn PDF document text
    • https://cdn.sqhk.co/bopesajan/i2jbchj/68312957035.pdfIn PDF document text
    • https://cdn.sqhk.co/jewimebobi/2jdhdzy/dubaxegegudefozutopowaxal.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/ifhevhb/ritopujepiravifojoxi.pdfIn PDF document text
    • https://site-1176800.mozfiles.com/files/1176800/38059209557.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/makumapikeze/come_ritrovare_foto_cancellate_android.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/kumedirajozuvaxuseb.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/vusurifonusut.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/abc_reporters_contact.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/wuwuzapu.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/86558185319.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/bhojpuri_video_new_song.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/biteteninideredoxuzitaf.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/alphabet_letters_with_pictures_and_words.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/nike_tech_fleece_joggers_size_guide.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_off0002a4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A4BD 5196 bytes
SHA-256: a3e4d39a87039a55d0d73bc056908a91523de5e6260e6b029dce3efdbfe1fdc3
font_01_sfnt_off0002b643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B643 13244 bytes
SHA-256: fbaa491d7e9726ce69832d24d91e45535ce8c90140c20733f8923b962affe747

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