Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca03ba9fd16f3611…

MALICIOUS

PDF

86.3 KB Created: 2021-02-12 02:35:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a5ca26ec15cd9d2937e45878db4adb2f SHA-1: 8618c8e67929b317a81836df1abc391d6395d2a1 SHA-256: ca03ba9fd16f36112495dd926ffc2b2f8f175aae4ca9ebc798da33fa5b71b66d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly suggests malicious intent. The embedded URLs and the nature of the link farm suggest a potential distribution vector for further malicious content or phishing attempts.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/123?utm_term=ancient+egyptian+dance+music PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4460457/normal_5fc596d2a73c0.pdfIn PDF document text
    • https://cdn.sqhk.co/zudusidesu/a8mjjJO/free_las_vegas_slots_to_play_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496816/normal_5fd03c101f73e.pdfIn PDF document text
    • https://tupinikuwexopej.weebly.com/uploads/1/3/1/0/131070806/dumonunadiki_nazivanis_kafomitagitilop.pdfIn PDF document text
    • https://cdn.sqhk.co/fagevibe/gfkidZt/kobe_bryant_dunk_on_lebron_james.pdfIn PDF document text
    • http://endi-itali.space/nhng_tit_mc_vn_ngh_hi_hcndvpx.pdfIn PDF document text
    • https://pijaxulejogelub.weebly.com/uploads/1/3/0/8/130874219/b84ee7264e2733.pdfIn PDF document text
    • http://bigswinner.space/75224384984yvrhu.pdfIn PDF document text
    • http://italywow.space/33844222144l5uv2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425229/normal_5ff9014408bd7.pdfIn PDF document text
    • https://cdn.sqhk.co/givogaduta/jjikjeW/tudupusojikevelexivuvod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379970/normal_60152a0e96bbf.pdfIn PDF document text
    • https://cdn.sqhk.co/jifigetuxu/ih0Nkje/56674115323.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000110d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D2 5356 bytes
SHA-256: c42bb38520388aa2d575d6c32ac5b4becbbd40e5ff3e2e1ecdbe007236cfc618
font_01_sfnt_off0001230a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230A 13644 bytes
SHA-256: 78b65c74d433fa529d5178007f0ca298b3a4c971df325653d0cd75c7de838de3

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