Malicious PDF — malware analysis report

Static analysis result for SHA-256 061fb9f4e1919895…

MALICIOUS

PDF

90.8 KB Created: 2021-05-12 16:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7be940dc0b547cd986d967adaf8c5d36 SHA-1: f54b305157e8116aaf3c34d91fd268b8bac67b62 SHA-256: 061fb9f4e191989524d5d6b9b66de137cfa27fc48f8b6f8a5c9a5ee91e83a37f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm designed to redirect users to malicious sites. Heuristics like PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM, along with ClamAV detection as Pdf.Phishing.Trojan, strongly suggest a phishing or malware distribution campaign. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://gimoguvi.ru/strik?utm_term=is+husqvarna+a+good+dirt+bike PDF link annotation
    • https://tatunonomufobuf.weebly.com/uploads/1/3/4/3/134355176/657a5df7.pdfIn PDF document text
    • https://gipavenox.weebly.com/uploads/1/3/5/9/135966662/1836c347ef.pdfIn PDF document text
    • http://shop-profildoors.ru/zitozupariwadojupapexoja8roov.pdfIn PDF document text
    • https://dopovubejaxow.weebly.com/uploads/1/3/4/0/134017692/zazek_larogofipa_vazidipulepup_boverazisaxak.pdfIn PDF document text
    • http://sport-stavki.fun/7._snf_sosyal_bilgiler_iletiim_testieduv7.pdfIn PDF document text
    • https://pepedojimu.weebly.com/uploads/1/3/1/0/131069997/8beb157b515d61b.pdfIn PDF document text
    • http://sentytld.online/pamevufatuwujusuzid3mah.pdfIn PDF document text
    • https://kifesajisibak.weebly.com/uploads/1/3/4/8/134884742/5204721.pdfIn PDF document text
    • http://fupefabesosada.mygamesonline.org/adding_subtracting_multiplying_and_dividing_fractions_worksheet_with_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7f793f8f-877f-420e-851b-8bae9ea62a4d.filesusr.com/ugd/78c764_f5ce31ab4aae44aaa316868a3241311b.pdf?index=trueIn PDF document text
    • https://0ed7c29b-d5f2-4290-8b47-add6aa38300d.filesusr.com/ugd/32a223_3336be004fef493fb1680497df703639.pdf?index=trueIn PDF document text
    • https://13006a6e-9b3f-4191-9e3f-064114488741.filesusr.com/ugd/34464a_54e681029ae94e4a92418bdf10b8ccfd.pdf?index=trueIn PDF document text
    • https://d8aee3b0-83ea-4a0d-b8f9-524a85b41d10.filesusr.com/ugd/105b34_ed7a059084114a86923be95f0a85bd60.pdf?index=trueIn PDF document text
    • https://0621cc9e-6449-4e8a-a8bd-baee9ad62a2c.filesusr.com/ugd/affb4a_dc4fefb109c14f488d903e2602089791.pdf?index=trueIn PDF document text
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_b33f69cf80df43388b88d1ebfa61d41d.pdf?index=trueIn PDF document text
    • http://widepidaba.atwebpages.com/how_molecular_shape_affects_boiling_point.pdfIn PDF document text
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_ad10f987d6874dc3975033f86f51a811.pdf?index=trueIn PDF document text
    • https://87da31d5-d184-45e7-a456-0ad082c8bd65.filesusr.com/ugd/55e94a_5687a235b16a4fccb11dcdf39dbae3ee.pdf?index=trueIn PDF document text
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_2c5cae2f3ae54c1596fcbf10b6892d58.pdf?index=trueIn PDF document text
    • https://b18ac5c8-c825-4c59-a0a1-290c879ce4f6.filesusr.com/ugd/1a0fde_b48e587e749e41bda3e8140aa7a98ed7.pdf?index=trueIn PDF document text
    • https://b89c0965-50b5-483f-b67e-52f573158f4f.filesusr.com/ugd/1e222e_d675c3341be6412f8f1a8619086243d3.pdf?index=trueIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_e65d730a2633481fab8ead201b503284.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A03 5384 bytes
SHA-256: c79f4bd650a840d567e6aa1c45606162399f874e1e9792b96d27095afbc40d68
font_01_sfnt_off00011c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C46 11056 bytes
SHA-256: 1064aa5bf61fd93d941772f75f9683acfa9592b943aaf9ef5b9c76637d1bcc16
font_02_sfnt_off000141f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141F6 17944 bytes
SHA-256: 9b230e130b5f77c1bb462b60bfe6801c9b0e42a72e9232c7bda84fbba0883f62

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