Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f7f2116af11f593…

MALICIOUS

PDF

68.5 KB Created: 2021-02-22 08:09:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 32ddc31fde7732efe799daf4f08cefaf SHA-1: 940aaa3d418cf9dfd449177b08ca509956abda62 SHA-256: 1f7f2116af11f593d8f98774157cd2b450b7caa94e68fa5481d1a99e5636d05d
156 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. 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-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.
  • 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://baarspo.ru/strik?utm_term=investment+science+luenberger+pdf+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4488316/normal_5fca7a662101d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452862/normal_5fcbd040c9008.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375525/normal_602db42d20c83.pdfIn PDF document text
    • https://luvagifewu.weebly.com/uploads/1/3/4/7/134766249/zulose.pdfIn PDF document text
    • https://xedutorapul.weebly.com/uploads/1/3/0/8/130813372/812aaeac1095023.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403687/normal_5ff64ae8aca66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390371/normal_602908263ef37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470678/normal_60217874f3384.pdfIn PDF document text
    • http://regivag.iblogger.org/audio_to_text_converter_software_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485699/normal_6023a69c4a209.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471273/normal_5ff3a0efa8c09.pdfIn PDF document text
    • https://gusijanuvo.weebly.com/uploads/1/3/0/8/130874241/bizomevetova.pdfIn PDF document text
    • https://gixatupugibezi.weebly.com/uploads/1/3/5/2/135296842/ganofamilafo_wuwimoxirigili_jufakixan_xunemugibuf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483591/normal_5fc61f2f1756a.pdfIn PDF document text
    • https://romugazasemagop.weebly.com/uploads/1/3/4/8/134897733/3239291.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365998/normal_5fe0b382d74f8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dovixuti.rf.gd/92141102793.pdfIn PDF document text
    • http://bujitajaxo.epizy.com/free_weekly_workout_schedule_template.pdfIn PDF document text
    • http://zabirozoxut.epizy.com/buwizedoposunuvawakira.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_off0000cef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF2 5704 bytes
SHA-256: d50abecbe0f27d055da0c3dc576d204cc42f1d1f80439f533c3390f4f27c3943
font_01_sfnt_off0000e257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE257 10176 bytes
SHA-256: e037f166223d4ea2682d8ce3732f998403fed447de5574a52ea2a5ef8e42203e

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