Malicious PDF — malware analysis report

Static analysis result for SHA-256 51899020ca298160…

MALICIOUS

PDF

79.8 KB Created: 2020-12-01 03:07:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: aad5529c396e9f0b4455033fdd8f3b2c SHA-1: 9862e08493c58d52f954b49a4ce9dbdca345bb70 SHA-256: 51899020ca2981608593cdcf7a562fbec8ec909c1b311945e54017ec7d8646b8
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a malicious redirector link to 'ggtraff.ru'. Another critical heuristic indicates a PDF link farm, with one example URL pointing to a potentially malicious PDF. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ggtraff.ru/aws?utm_term=perfect+match+taiwanese+drama In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369928/normal_5f88a3ef70e40.pdfIn PDF document text
    • https://xexegetogud.weebly.com/uploads/1/3/4/3/134375989/nopedirir.pdfIn PDF document text
    • https://bonujuvab.weebly.com/uploads/1/3/2/7/132740321/4533194.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd067873299f0c543b1ca0/1606223482037/ethical_hacking_apk_uptodown.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc121b616f6d44b07c02f3f/t/5fc4c66a3570fb44d1992603/1606731370762/square_root_of_60000.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/widosoviwigi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc18b2c68612547ed62b026/t/5fc3927a61e25426e1a6030f/1606652538604/gamanep.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf6b43e6d49a06bb8a7036/1606380356482/cosmic_distance_ladder_lab_answers.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc36a5ebda9c57a97ce2be0/t/5fc487bff8cdb769c6747e7e/1606715327779/72028332138.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc117e49955c744b53cb0dd/t/5fc51103fa04221c71c04727/1606750468150/fireboy_extinguisher_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/lesumowifofugiwixug.pdfIn PDF document text
    • https://s3.amazonaws.com/dojonuta/kivojuv.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD335 12544 bytes
SHA-256: e7799e2901e282fcd0a1b3d7db340d086bc352d8998b5afcb49d93c410f134a6
font_01_sfnt_off0000fb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB39 5320 bytes
SHA-256: 98eef1f29d1552ef8e314b4bf687d5b3e02edfc2107cb00d78d08b5e1f47204c
font_02_sfnt_off00010d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D36 11180 bytes
SHA-256: a545071edcf77c83786c9891d286a186ce07c1ccf4e79ba9d4315d5cecfc699c

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