Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7fe5c57ff8eee0e…

MALICIOUS

PDF

68.1 KB Created: 2020-12-05 04:47:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5a96d11a2eb41036be4d668320cb3b2d SHA-1: be450107f32a6fb1ba8a87dbd77d2dcb124d8303 SHA-256: c7fe5c57ff8eee0ec04a663cb46685c3b3c19789e065faed62d166b9f3aa4a39
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with at least two identified as malicious redirectors. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a strong attempt to direct users to harmful sites. The ML classifier and ClamAV detection further support the malicious nature of this file, likely used as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://traffking.ru/strik?utm_term=newyork-presbyterian+brooklyn+methodist+hospital+volunteer In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382190/normal_5f9146983af68.pdfIn PDF document text
    • https://mojipolizu.weebly.com/uploads/1/3/4/3/134318612/wuwiripomexig-miziz-ruzalewoze.pdfIn PDF document text
    • https://sogovowezop.weebly.com/uploads/1/3/4/3/134324678/daroxisozatitexofag.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/wavaduluwawajoramitu.pdfIn PDF document text
    • https://wolunogejafijut.weebly.com/uploads/1/3/4/6/134649672/8933788.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/zafifurutisovet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/potofaw/turnip_jack_o_lantern_decoration.pdfIn PDF document text
    • https://s3.amazonaws.com/dazutun/dynamics_of_mass_communication.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/shipment_information_sent_to_fedex_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/lego_dimensions_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/ffxiv_cooking_leveling_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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC6 5540 bytes
SHA-256: 6e33065407c645e009e55fa848df7c61f5a8518cdc28bdc042a3ed0502f005af
font_01_sfnt_off0000d08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08A 10884 bytes
SHA-256: 3483d6382c22e4b1d0724fdef1b6b58f2b6a7d3e8a3cdc80d0b58dbbf36f2b0d
font_02_sfnt_off0000f57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57C 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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