Malicious PDF — malware analysis report

Static analysis result for SHA-256 c82d63ad37cdeaa5…

MALICIOUS

PDF

85.3 KB Created: 2021-05-07 09:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0701c10a90ce13ca44e301b04944ebb1 SHA-1: 2928d60a3787dda659959ecfba99948ce8890dff SHA-256: c82d63ad37cdeaa5156cabfefd2745c13a42776c446a388140cb04ed84227dae
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, which is characteristic of SEO spam or phishing lures. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of numerous external links suggests an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://bologen.ru/strik?utm_term=what+sniper+rifle+do+army+rangers+use PDF link annotation
    • http://baltika-trans.ru/59984775436cn0e7.pdfIn PDF document text
    • http://henrysavbr.site/jewafinedehh8vv.pdfIn PDF document text
    • http://autokenn.com/6469835390v1qti.pdfIn PDF document text
    • http://show-visitor.xyz/duveribodowefiegj9x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428334/normal_5ffbb230b7264.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377377/normal_5fcf00272bf0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387808/normal_6029019b363b2.pdfIn PDF document text
    • http://ita-fitness.fun/fogirebivobegunasotiwolizc0obj.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://uploads.strikinglycdn.com/files/eb8a39be-1ce1-402b-a29e-835e9892c6bd/netosabu.pdfIn PDF document text
    • https://13cfbe10-32e4-4d7a-9072-8dbd3280e6b8.filesusr.com/ugd/994e9e_3c1345e33f274d218814e5d2d867b67a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/025fb6f5-4ea5-4833-b52e-644a1d83a539/the_purpose_of_writing_a_personal_narrative_is.pdfIn PDF document text
    • https://7737876a-f762-42ef-af6f-18b78abacabf.filesusr.com/ugd/9066bd_87ffa116aaaa4357ab2fce48a48e344c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a553141-2d43-4ffd-9664-2e7481a382c8/66101251001.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4e6c48c-3c08-4f04-9600-d44a5b559d85/oxford_word_list_for_grade_4.pdfIn PDF document text
    • https://a3abd3d7-f7e4-4b0c-86b7-ec358d8c805a.filesusr.com/ugd/97a3b3_372b4398381747e7aa443c8992042987.pdf?index=trueIn PDF document text
    • https://19d8af67-ac20-4a7c-8ffd-69be953788a8.filesusr.com/ugd/578741_3e3cca04cc5a4d57b6cff4f4a61fd02f.pdf?index=trueIn PDF document text
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_f7f3d19f449b4dab8c87c0d380113844.pdf?index=trueIn PDF document text
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_7ac8623c7e754254a68062b227cb8df2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e2f7e33-6f9c-4518-84c5-3186801f80df/65478864232.pdfIn PDF document text
    • https://ec2d952e-5494-46d8-b841-fee222248b17.filesusr.com/ugd/9713d5_4c7955b0c747410c8803e0c23bbd1177.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2f6e6e4-a1bd-4beb-a73a-8996d6701b0b/pirosizabiwapikiko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e6c7148-38b3-48a6-9db3-104626590a73/what_is_the_impossible_whopper_patty_made_of.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a84539d-72a7-4198-861e-fa8cabd12dd7/the_metamorphosis_quotes_about_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecb99286-8e67-45ba-b747-b2f5df6a2e02/33596127165.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_off000101f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F4 5452 bytes
SHA-256: 45a75b4d1d8d6a78fac7d06e4e82dd35c3e74337abcd1169b8f1efc8a0c29463
font_01_sfnt_off0001145b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145B 10768 bytes
SHA-256: d65e69758463c42aebce54e37a035522561361fde34aed927d4105df3755a6de
font_02_sfnt_off000138eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138EB 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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