Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a5cf89da8e626dd…

MALICIOUS

PDF

122.7 KB Created: 2021-04-07 09:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4ac95c9fd883719e8706e78f6be288ab SHA-1: 9b49152fb99e133d7d2f4e3b883b876b28188100 SHA-256: 3a5cf89da8e626ddfd79b4341c2ff555f7fa54e1cf1e6ef4aed6300f11df0e85
164 Risk Score
Tags
free-cdn-ebook-manual-lure

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://leonvi.ru/strik?utm_term=2003+craftsman+gt5000+specs PDF link annotation
    • https://kenojulovananav.weebly.com/uploads/1/3/4/0/134016885/2612936.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528915/normal_604d5e0b1e2d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374532/normal_601153928a38a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4526930/normal_5feb57189ee09.pdfIn PDF document text
    • http://boxidodo.22web.org/3049273497.pdfIn PDF document text
    • http://bigojojodun.iblogger.org/logic_gates_using_diodes_and_transistors.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425929/normal_602d5dc1b7b0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448347/normal_602ebf7a3a437.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381318/normal_6068c218241c1.pdfIn PDF document text
    • http://pusuwanoxanopo.22web.org/codycross_answers_group_2_puzzle_2.pdfIn PDF document text
    • https://magapevalapa.weebly.com/uploads/1/3/0/8/130874167/jujuxuwor.pdfIn PDF document text
    • https://rimuloxizozo.weebly.com/uploads/1/3/4/5/134589703/7a030d43d097cc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jefokilekik.rf.gd/43027859998.pdfIn PDF document text
    • http://nasakil.rf.gd/literary_devices_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/60930117841.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/conclusion_of_internship_report_of_hotel.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/58532062676.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/14459879892.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/67981811334.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/9546090510.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/52785777340.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_off00019d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D68 5768 bytes
SHA-256: 2c63ee09bf01ed684feec3aef5019750ec9064e51c024f14da8184d88621bd7b
font_01_sfnt_off0001b0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0FC 12580 bytes
SHA-256: 96a17e2e3f82fb2bcb51cd5a695a71c3e30a447942c4caf89ae24814f03428b0

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