Malicious PDF — malware analysis report

Static analysis result for SHA-256 68c61637ac0f0cb9…

MALICIOUS

PDF

95.0 KB Created: 2021-03-19 07:13:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8abd0d2e9f7470f36084ba714056bc1a SHA-1: 58d4dbc26e00375f29afc17fb7849cae2afe6020 SHA-256: 68c61637ac0f0cb9b330fd98ba91f9ed94039659d20e475491aa798ef0aeb87d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it is part of a link farm designed to drive traffic to potentially malicious sites. The primary malicious URL identified is https://mezovuduw.ru/wix?keyword=atticus+finch+quotes+tom+robinson+case, which is likely used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://mezovuduw.ru/wix?keyword=atticus+finch+quotes+tom+robinson+case PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388819/normal_600e85f65c28d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385634/normal_5fd63a7a0d65a.pdfIn PDF document text
    • http://notevidesi.22web.org/55980308659.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420240/normal_5fef425aaecb1.pdfIn PDF document text
    • http://varuzajuv.22web.org/zulol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_81d2ebbc9d1f4902b73d411554c444e7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5d54167-5bb6-4900-9f81-929957ceb7c7/jofozenalawetazutewap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bf246db-6198-403b-8aa1-25ab58833087/how_to_write_copyright_symbol_in_phone.pdfIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_6538fcd522894bdd93cd221efbf1621e.pdf?index=trueIn PDF document text
    • https://8f94a8d2-f39f-4229-8700-bad9ca92d526.filesusr.com/ugd/1d3654_8ea1e5fa9f9d4d04814ba05365288b02.pdf?index=trueIn PDF document text
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_8a113ff50eec413a9ea0c16754f29463.pdf?index=trueIn PDF document text
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_0cf2cf6470a44046874c025b53164139.pdf?index=trueIn PDF document text
    • https://de7eff9d-5c50-4122-bb99-ee112abf7a8f.filesusr.com/ugd/db8f21_061eceb9a9d94677b13c8ed681191dde.pdf?index=trueIn PDF document text
    • https://cd9ed9ec-87d1-42be-9198-0b2de6c1db4d.filesusr.com/ugd/158fb9_a18cb835ea744b77bd25c8fc3e64fd5f.pdf?index=trueIn PDF document text
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_e4651791ddfe44139b6f2855be446720.pdf?index=trueIn PDF document text
    • https://0c2a99dd-71fd-4a0d-b96f-672cfa785c21.filesusr.com/ugd/515c54_a53050038599466da916fcb4e9f3ee64.pdf?index=trueIn PDF document text
    • https://f8bd9030-4518-40b4-9047-d478e6ffc17b.filesusr.com/ugd/608fe2_ca4cb3ad790e48a29615df2c56861894.pdf?index=trueIn PDF document text
    • http://juroluse.rf.gd/xajufoso.pdfIn PDF document text
    • https://7980b0ff-2efe-48f4-a442-6c87bca80713.filesusr.com/ugd/9bd8c3_5dc7968f034a4d71b5bb36e5f5815fc5.pdf?index=trueIn PDF document text
    • http://pukojunobewev.rf.gd/28040490069.pdfIn PDF document text
    • http://xarezebabanadot.epizy.com/23749864904.pdfIn PDF document text
    • https://def26600-86c9-4442-a738-094ddf2992d1.filesusr.com/ugd/eb5a6a_c3f513d1a89a4afea4622a4b2bcc6f50.pdf?index=trueIn PDF document text
    • https://73099f28-10d5-4558-98a1-2f8dc61f1a2f.filesusr.com/ugd/f62eaa_240f6fb78e264d5d9c7593e1b19be7cf.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000135e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E6 5344 bytes
SHA-256: 06f5c8a7e5aacb0b7fc4c994cf9736c92ea26b5570426038c0adc9e6e36662b3
font_01_sfnt_off000147ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147ED 10784 bytes
SHA-256: c9fef6a9682cf99b11173a237f514bc6c7aaf17b0f614aebcce8037ea84089b9

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