Malicious PDF — malware analysis report

Static analysis result for SHA-256 3721a96ea1019e49…

MALICIOUS

PDF

69.7 KB Created: 2021-01-30 15:04:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 50aa7ebd109311772c98edf9713bbe81 SHA-1: ec5dd2a70b7fd5d1996daccd432c6895468996e4 SHA-256: 3721a96ea1019e49a305e2e0ba80e5c0d7741d815faafa24eb0e42830fa5d0cc
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It contains an external URI pointing to a suspicious domain, likely intended to host a malicious installer. The presence of a 'download' button heuristic further supports the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/aws?utm_term=catalina+installer+without+app+store PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4453579/normal_6007fe0b52856.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367019/normal_6005f59da49f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445341/normal_5fd274057f336.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408323/normal_6006a3e58484f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385214/normal_5fc9e7b930011.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410013/normal_5fe618f29adcb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402507/normal_600b464296c9b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451561/normal_5fedabefe2564.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408478/normal_5fe7a699a0146.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390382/normal_5feb8b316a67d.pdfIn PDF document text
    • http://memenakamawe.iblogger.org/37613955416.pdfIn PDF document text
    • https://cdn.sqhk.co/sozaxejiv/f4jgTjg/nizowuk.pdfIn PDF document text
    • https://cdn.sqhk.co/sejejajoxej/upyRhc9/22551406624.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/futamo/82195616148.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/4795350171.pdfIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/ragnarok_dual_dagger_assassin_leveling_guide.pdfIn PDF document text
    • http://nodikisiti.rf.gd/matukasaxoso.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/5080333880.pdfIn PDF document text
    • https://s3.amazonaws.com/xulikamul/games_2018_new_computer.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/gaming_keyboard_buying_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/kizotinofa.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_off0000d613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD613 4904 bytes
SHA-256: bab72a9c1990762b3aa366f1f7770e2a74a450138b2d5b0610a315eae82ee2a9
font_01_sfnt_off0000e6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C8 10192 bytes
SHA-256: 593e02331f48c87b155fe9068c33b651ae01b10092b80415cd67eab52c3fec67

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