Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1bc6ce73ce8cbd3…

MALICIOUS

PDF

72.7 KB Created: 2021-03-07 12:16:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e0415d09e8dc98ab4ae372438db52fc2 SHA-1: 187ec6626ce99d3f3d4ceb110d46ad8b9e645a1e SHA-256: b1bc6ce73ce8cbd366ed60a306b4b2e36ae397e6b519ab8f4c91782187ac7f47
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://leonvi.ru/aws?utm_term=how+to+use+a+convection+oven+to+reheat+food PDF link annotation
    • https://cdn.sqhk.co/baruduwege/VMogcih/wokigoxasuvokowu.pdfIn PDF document text
    • https://cdn.sqhk.co/zojixemem/Widgigk/sunday_school_songs_telugu_mp3_free_download.pdfIn PDF document text
    • https://niritopep.weebly.com/uploads/1/3/4/6/134634222/gimevob-mirobom-dofobaku.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/ictsjd3/pixel_running_out_of_space.pdfIn PDF document text
    • https://cdn.sqhk.co/sepetuvab/idGKUjf/juzijeforobekopikos.pdfIn PDF document text
    • https://kibewibur.weebly.com/uploads/1/3/1/8/131856655/dajebunezonar-bajiter-vixarupiwegaxu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_541390c18d4c474e985bef570a83c69b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dagasopones/bilebaxutalogavavif.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/excel_exercises_for_students.pdfIn PDF document text
    • https://1e8c0764-4a0f-46ab-84a2-5f63a8a44928.filesusr.com/ugd/6a0acf_a07ebe52ac8442048d9854824d08ae19.pdf?index=trueIn PDF document text
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_66feb0fcabd7406c91576fc29655c7b4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/99717480773.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/83787522429.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/fallout_shelter_special_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/piredatevexanurif.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/content_calendar_template.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_off0000e118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE118 5188 bytes
SHA-256: c48a0d2a5e9578fc333b4de92f5773ad3032d9aaacf08cf98d39f619e98877e8
font_01_sfnt_off0000f2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D0 10220 bytes
SHA-256: e18beec4baaa09e72b4a05d778bee8412ce5b1f184623ecda80e565fadb93edb

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