Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c87d1fd068202d…

MALICIOUS

PDF

73.2 KB Created: 2021-02-09 18:46:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 2eed70c62a957ae5fac46ba0d23ddda4 SHA-1: 0ee2407b5b6c7fc6d4a3f7b78842019d7b2004e9 SHA-256: a6c87d1fd068202d8848a159aede66ef7d9c9a647cc6f7e59a82ad4ac4b0e9c1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/123?utm_term=polynesian+tattoo+meanings+pdf PDF link annotation
    • https://tepaxomiro.weebly.com/uploads/1/3/6/0/136019937/f6e4ff2.pdfIn PDF document text
    • http://bobiruropiles.22web.org/blank_cheque_images.pdfIn PDF document text
    • https://xozejobe.weebly.com/uploads/1/3/1/4/131406614/9c5db5.pdfIn PDF document text
    • http://stylecurtains.com/bifatokadosot02t9o.pdfIn PDF document text
    • https://pavofadibap.weebly.com/uploads/1/3/4/3/134370944/4696837.pdfIn PDF document text
    • http://flylovel.com/we_bare_bears_match_3_repairs_apk_modddn07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445325/normal_5fd3852e96464.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449629/normal_602178b52fbac.pdfIn PDF document text
    • http://mnclassis.org/digital_classroom_library_checkout_system3gs4g.pdfIn PDF document text
    • https://kumaradogutaf.weebly.com/uploads/1/3/0/7/130775833/bivanopew_samavulukuze.pdfIn PDF document text
    • https://vafabifagid.weebly.com/uploads/1/3/4/5/134583570/a4baa7d.pdfIn PDF document text
    • https://foramifetutimif.weebly.com/uploads/1/3/5/3/135347605/8b6d00574.pdfIn PDF document text
    • https://pimapavidi.weebly.com/uploads/1/3/2/7/132740410/5e6f93fd7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dorowoz.rf.gd/19110438084.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/mass_moment_of_inertia.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/bts_fire_song_ilkpop.pdfIn PDF document text
    • http://zekubegem.epizy.com/begotu.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/assistant_commandant_cisf_uniform.pdfIn PDF document text
    • http://zonidagaxa.epizy.com/84685087666.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/13346615221.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_off0000e0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FE 5368 bytes
SHA-256: 1478d1892dc7299270783de6c352eb1ad64c06c9014734befca32e37649129be
font_01_sfnt_off0000f344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF344 10600 bytes
SHA-256: 1a708bb11d1a6cef5c0e875a09c2cabed4746de5ce84a5ae7fdd287d4fcaab98

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