Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c2a7ae91201e67…

MALICIOUS

PDF

82.2 KB Created: 2021-05-23 10:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36ddd83ae2a4e59f31f70112ab29cace SHA-1: 73d14f213ded369465f54b1b5d01607294fdcc13 SHA-256: 57c2a7ae91201e6754cc384d5b993f7212ad1727b252233af367c2c65b446e12
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to potentially malicious domains, indicating a link farm or redirection scheme. 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 embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/strik?utm_term=piano+accompaniment+patterns+book+pdf
    • https://nowesepi.weebly.com/uploads/1/3/1/1/131164229/f020b96378b9006.pdf
    • https://nosisakapu.weebly.com/uploads/1/3/4/7/134773138/pezemavuxixejalag.pdf
    • https://bunoworerut.weebly.com/uploads/1/3/1/4/131438217/wevuzaj-fonog.pdf
    • https://cdn-cms.f-static.net/uploads/4500910/normal_601f5f04dc304.pdf
    • https://rolugoxeve.weebly.com/uploads/1/3/1/3/131380951/fidemexopu.pdf
    • https://bezesigut.weebly.com/uploads/1/3/2/6/132681157/jajirinoruxaxodemeg.pdf
    • https://cdn-cms.f-static.net/uploads/4369916/normal_5fe76a96606f6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b975499c-b484-44cc-86db-51b15816b13d/49510942711.pdf
    • https://uploads.strikinglycdn.com/files/697ff832-34d4-425c-afc2-3cda1336a449/saitek_x52_flight_review.pdf
    • https://uploads.strikinglycdn.com/files/c495d9da-1c90-4593-bdde-a65d89df4a80/excel_data_analysis_toolpak_missing.pdf
    • https://uploads.strikinglycdn.com/files/9f84ffe5-e33a-4118-ad60-e99edc79959b/19436991786.pdf
    • https://uploads.strikinglycdn.com/files/361dedb9-6105-4958-8e71-874231cbb75d/xomebaxipekupavoxuba.pdf
    • https://uploads.strikinglycdn.com/files/836c6ac1-76ce-4d70-80a4-2a5c0c82f079/xibabumip.pdf
    • https://uploads.strikinglycdn.com/files/ecf9e227-4cd2-4a90-9adc-ca263afde979/cloud_computing_certification_training.pdf
    • https://uploads.strikinglycdn.com/files/47d40aad-1215-4d61-a6db-1cbd613d5d5d/the_texting_bible_reviews.pdf
    • https://uploads.strikinglycdn.com/files/393e0cd9-cfef-4645-acc1-252ae6cbe5dd/45034538349.pdf
    • https://uploads.strikinglycdn.com/files/4fc52f3b-4045-4db3-8841-5f8117f37e77/what_are_some_health_and_wellness_topics.pdf
    • https://uploads.strikinglycdn.com/files/81cfddb4-ca3c-46b7-b8ad-e0fd9e420e51/85271294160.pdf
    • https://uploads.strikinglycdn.com/files/deab4df2-fd74-4320-bae7-04b02c8c96cf/finding_interest_rate_and_time_in_compound_interest_examples.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102c9.bin
e4ba1c573328cfa53c73772fe6f2f8dc7a0503269088208ac21f4e4d2ecb86da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102C9 5476 bytes
font_01_sfnt_off0001154e.bin
41eb56897ddfcaa44d5a85f539ee0f48797a83506083ca4209b8ba8b1fb87332		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1154E 11112 bytes

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