Malicious PDF — malware analysis report

Static analysis result for SHA-256 797b378fc9eeaffd…

MALICIOUS

PDF

69.4 KB Created: 2021-01-15 10:41:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5a693e11f7dbb330de115ed4df5da19f SHA-1: 75456541b5b17988986bac7073f7a5a42959b6a3 SHA-256: 797b378fc9eeaffd197a190e184816c202b807221e5fa368a5c89e4de0623fec
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of an external URI pointing to 'traffnew.ru' suggests an attempt to redirect the user to a malicious site or download a payload. The heuristic 'SE_DOWNLOAD_BUTTON' further supports the phishing or social engineering 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://traffnew.ru/123?utm_term=msi-7596+ver+1.2 PDF link annotation
    • https://site-1177512.mozfiles.com/files/1177512/16709836122.pdfIn PDF document text
    • https://site-1168163.mozfiles.com/files/1168163/49528280366.pdfIn PDF document text
    • https://site-1177759.mozfiles.com/files/1177759/jobelitizulenuragegulala.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500674/normal_5fed519864d1f.pdfIn PDF document text
    • https://site-1178112.mozfiles.com/files/1178112/76041633111.pdfIn PDF document text
    • https://site-1174461.mozfiles.com/files/1174461/wiwubitipog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392661/normal_5fcdbe1cb30c7.pdfIn PDF document text
    • https://site-1247665.mozfiles.com/files/1247665/bayonet_hand_deformity.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/kudowo/guwinidugoxulebomitu.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/gefuvutuzawuge.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/berlitz_intermediate_spanish.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/98197112794.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_off0000d174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD174 5264 bytes
SHA-256: b4f45f63a6c451ab57abaa74b0986db776b3ca08c9ea6388ab69c8c5224ba76f
font_01_sfnt_off0000e39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39A 11184 bytes
SHA-256: 6b6906792c8e3862ddda9e476d2de416f74667c2e82029dd5b20ee7cf1b04960