Malicious PDF — malware analysis report

Static analysis result for SHA-256 49ba2df3822df3b2…

MALICIOUS

PDF

84.9 KB Created: 2021-04-26 00:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f7399b5f39aec89727fd4b5d0d700aea SHA-1: 89dc9d42d7091d4a566adb227f14faf2d7e8484a SHA-256: 49ba2df3822df3b247d87ea40f0708bab56a3cf64cf07276b40808e5e085820d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristics point towards techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://baarspo.ru/strik?utm_term=risk+management+information+systems+defined PDF link annotation
    • http://ruvujagefeko.mygamesonline.org/kujir.pdfIn PDF document text
    • http://autobuff.xyz/97897781178y7gs2.pdfIn PDF document text
    • http://1fps.ru/32195136660h2sqp.pdfIn PDF document text
    • http://dokukuke.mypressonline.com/basavamo.pdfIn PDF document text
    • http://adanakebap.org/93457951715gzsk.pdfIn PDF document text
    • http://sujolisake.medianewsonline.com/sifoxuvi.pdfIn PDF document text
    • http://tohld.in/fuderusodofizonutef7ooii.pdfIn PDF document text
    • http://nufivuzelikonax.getenjoyment.net/fidoluwetiborovo.pdfIn PDF document text
    • http://ginixotojaru.medianewsonline.com/ispad_guidelines_dka.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://b3709dad-42f4-4621-9b7e-74d31ca978cd.filesusr.com/ugd/f91cf1_248a869ad29044e6b77222c9def0131b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zamuriza/47500846163.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0f0ad22-9c25-4aa5-b27c-42013677646d/stoichiometry_and_states_of_matter_word_search_answers.pdfIn PDF document text
    • https://7d14b3fe-44ab-47f5-a5a4-fb5d7998febd.filesusr.com/ugd/ba499c_25396a79762345e8ba282958128171ac.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/72e758d4-e913-4fa7-88c3-6af755118021/book_of_enoch_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/609fe3ce-8957-4731-84ad-9e92a7e5d92f/walmart_hours_el_paso_tx.pdfIn PDF document text
    • https://488a161d-122f-4e25-b35e-34d1d0e27b34.filesusr.com/ugd/bbc910_6d74c78e05fd498bb16d72b6d84e7ee9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed3b0aef-dcca-4d49-8a11-2ae4a86af4f4/kenox.pdfIn PDF document text
    • https://dab7fb03-f2af-4a8e-9cb9-31de623bedb3.filesusr.com/ugd/58b596_a612da731ece4de0958eb8ff8b7666ae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3036e845-ea76-4ef3-ac65-c534dea60708/nazabirar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/689fe3de-8149-40b0-95e4-2ba8ab7591fa/futipebezojelepi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dee1fe4-f97d-4a6d-8ac5-b35518a3db0f/why_does_my_canon_printer_not_recognize_my_ink_cartridge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18049572-81d7-4daa-8d08-309c09b9f174/what_are_the_3_types_of_drawing_dimensions.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/jepemax.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/97290304903.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_off000103ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CE 5156 bytes
SHA-256: a4cb5b9ff53aa390d833146db086328d39faf429e1d0649377a70c5ecb7e6d42
font_01_sfnt_off00011543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11543 10044 bytes
SHA-256: 38f8b49dc0d0476c2fa79dffae07191adc1f3bc9fa38b85be81474b814dfaa98
font_02_sfnt_off00013774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13774 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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