Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f1a4715679afeec…

MALICIOUS

PDF

75.4 KB Created: 2021-04-10 10:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a4c513d894553c30e259f20c865e816f SHA-1: ec9fb677c1da18cbd8b292c510e2280691977316 SHA-256: 6f1a4715679afeec06768391d994ca9171b3ed42219cdf8a9e5046e77e32e3b5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs point to suspicious domains, and the document body, though heavily obfuscated, contains keywords related to booking sites, aligning with a lure for malicious content.

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://nipisod.ru/strik?utm_term=cheap+hotel+booking+sites+dubai PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391009/normal_5fd9776ae4258.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370052/normal_5ffabb9edfa6e.pdfIn PDF document text
    • http://poradoit1.site/3346082958288xtv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416805/normal_601906fd0f64d.pdfIn PDF document text
    • http://strgb2.ru/japubafejebujuxkwrkx.pdfIn PDF document text
    • http://harkateine.fun/how_did_abigail_die_in_the_haunting_of_hill_house3b41q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383304/normal_5fc5e6d152d4e.pdfIn PDF document text
    • http://itdiscounts.info/matthew_hussey_he_never_texts_first0u9ef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fe426b01-1dd0-498a-b08e-7ec37e320b94.filesusr.com/ugd/6b45f0_ed71db39e0bf4bcdbc6d8db9d7f4246e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tarajix/70380286896.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/autodesk_autosketch_apk.pdfIn PDF document text
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_b5e5acb48a574f528ef3b66687f2310b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d88c05ec-4d50-416b-a346-853cb1a3aed8/how_much_do_air_conditioner_technicians_make.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/86884939386.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/listview_using_adapter_in_android.pdfIn PDF document text
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_1c30bb394b70419981fce56aa87b9313.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/956e22e4-db4f-4a3e-81f6-37f305b397e3/56658732946.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bccef79-1294-4c1c-96d3-015297aab93c/99133424649.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/craftsman_yt3000_mower_belt.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_off0000e82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82E 5236 bytes
SHA-256: 2b4fe0210a40fb72e9355f2c62851e34d9fecf04cde6469b75820d2bd4851ec6
font_01_sfnt_off0000f9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EB 10864 bytes
SHA-256: cadb5b2b4f67c1704adc8661b177a9bec904f1fdf2f7f3d0a89e278d95f485b0

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