Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc1ba88cc6247031…

MALICIOUS

PDF

70.2 KB Created: 2021-02-12 23:51:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c211f75ea559c1331b92d2dbfd7c82f9 SHA-1: 253d63864248a316bfa85a2a263d6232523a13c2 SHA-256: fc1ba88cc624703154640816ebc53452e6a2643d9d546c1556f899f910eb0322
184 Risk Score

Malware Insights

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

The PDF contains multiple links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to downloading software, suggesting a lure. The presence of numerous links on disposable hosting further supports a malicious intent to distribute unwanted software.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=download+cheat+engine+6.2+apk+for+pc In PDF document text
    • http://hamlikjorettoop.ru/boom_battlefield_mod_apk0ba29.pdfIn PDF document text
    • https://cdn.sqhk.co/bosesegivu/ghiN5pS/kinipakovowiwisavutop.pdfIn PDF document text
    • http://sfhgfje5df.xyz/825922380403e4o2.pdfIn PDF document text
    • https://cdn.sqhk.co/neviragar/gA0hcha/zutapetowokelobupoluxip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449618/normal_6016616a15189.pdfIn PDF document text
    • https://cdn.sqhk.co/kesavaki/gAhcM5X/smith_pharmacy_hours_brigham_city.pdfIn PDF document text
    • http://poroda.site/sajenajowigetugobuvhil2.pdfIn PDF document text
    • https://cdn.sqhk.co/woxemumi/bpigjaD/81244609886.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvivazonewa/ihhacQj/download_dead_zone_action_tps.pdfIn PDF document text
    • http://organize.shop/ganelopivunolijurodd3pjm.pdfIn PDF document text
    • http://onlineeshop24.xyz/anandam_telugu_movie_background_musics4rcy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458833/normal_5fe63e45b64a6.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/jbidicA/60301749447.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408463/normal_6001f7885d895.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dusined/burberry_t_shirt_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/free_unikey_vn.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/vespa_px_parts_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/factorio_lazy_bastard_0._17_guide.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_off0000d494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD494 5712 bytes
SHA-256: 43f5787f5ee7f6e88698330074881ed5d0e067eddd23051b82adc53468adbff3
font_01_sfnt_off0000e821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE821 10368 bytes
SHA-256: c9741340e00cbb058536a90a452960b7d514fbddfddc765320163a0737521742

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