Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf80dd165ff037fb…

MALICIOUS

PDF

69.4 KB Created: 2020-11-19 23:48:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e9ad5b56684f83352b26d9c284f0b3ca SHA-1: 435f18abe211887ba73341a23b33841f93391375 SHA-256: cf80dd165ff037fb8c790d9952ebf31cff5f72cac1ce7295bc97d9353dc9f7be
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, and it contains a significant number of external links, indicating a link farm or phishing attempt. The presence of PDF_SEO_LINK_FARM heuristic suggests an attempt to manipulate search engine results or redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • 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://trafficel.ru/123?utm_term=mp4mania+hollywood+english PDF link annotation
    • https://feromawafisoxi.weebly.com/uploads/1/3/4/5/134501851/a0f4704.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366965/normal_5f878787d4279.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376629/normal_5fa83c82f2a87.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/18616d98-b943-4752-8435-a3543f61e1e9/gezape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/216adc78-1cf6-4ba2-ab09-5cd2dbc2201b/welifevetujid.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/pdf_editor_delete_text_online.pdfIn PDF document text
    • https://s3.amazonaws.com/pukasojalu/rukonu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/051e92be-c8f7-46f3-bb1b-0ee06b71212e/direct_flights_from_florida_to_charleston_sc.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/conversiones_de_millas_a_kilometros_ejemplos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb118fec-ec4d-4774-9022-ae85cb1da0d7/brondell_swash_cl950_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff6f655d-203b-4c51-8ee8-ffe622ee1dc6/sofolezawi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/921e2e71-20cb-4f0a-a165-ddba18656817/megekot.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/unblocked_games_6969_strike_force_heroes_3.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/tevotuvanobor.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/fanodun.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/chemistry_half_life_worksheet_answers.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D2 5564 bytes
SHA-256: b17f46066641d1ff973c679c0fdea5e05776814593f60fb2cb2b621e5e6be4cf
font_01_sfnt_off0000e6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BD 10016 bytes
SHA-256: 92e7a261f41b6d2b947ff13a0bcf25dbf0c508253d844fe1ca3a834c872c3fd8

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