Malicious PDF — malware analysis report

Static analysis result for SHA-256 13708ffff6835781…

MALICIOUS

PDF

107.9 KB Created: 2021-04-24 12:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f9ebc30e83f9d317b3feda1897233fe SHA-1: 2edd1b550690872b24dd7389e55cfe802e6d9481 SHA-256: 13708ffff6835781ad0c9197ff236341d14068f8dcf727a845d81f94d02c2097
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO spamming technique. One of the primary external URIs, 'https://pelibifir.ru/strik?utm_term=david+walliams+family+background', is flagged as suspicious and likely leads to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://pelibifir.ru/strik?utm_term=david+walliams+family+background
    • https://pefoduzipim.weebly.com/uploads/1/3/4/3/134371740/5536378.pdf
    • http://dwatches.site/98683613526uta5p.pdf
    • http://furniture21.online/41525327030jt0nd.pdf
    • https://bufigolumixi.weebly.com/uploads/1/3/4/2/134234787/xofalowi_rozepabidur.pdf
    • http://jigikujed.scienceontheweb.net/33354626397.pdf
    • http://creditpm.com/how_to_sodastream_sourcenbs92.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_e6f7ea83fa5f4ee7ac227b2c04e7b831.pdf?index=true
    • https://s3.amazonaws.com/verirejon/constitution_tour_test_answer_key.pdf
    • https://s3.amazonaws.com/nuvukivaxiren/periodic_trends_worksheet_key.pdf
    • https://uploads.strikinglycdn.com/files/46d26622-d6e1-4704-bfca-80f610f7fde2/gesigebagebab.pdf
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_7cf00e8d3227441aa39251406383af91.pdf?index=true
    • https://d992f69e-bc5b-430a-92d7-abfd66d0380b.filesusr.com/ugd/6f7357_e9eadfca986c4bb4853bf642c1839460.pdf?index=true
    • https://71e5fc8e-cc9a-4633-96c3-2c70acd464d0.filesusr.com/ugd/f08e01_7c33f3e0d25941f09644fe4cf2748c13.pdf?index=true
    • https://s3.amazonaws.com/kulinisokakewi/troy_bilt_21_inch_self_propelled_lawn_mower_parts.pdf
    • https://uploads.strikinglycdn.com/files/70fca526-74ef-4365-a93c-20003e801579/26856961317.pdf
    • http://legokejapo.atwebpages.com/anatomia_carotida.pdf
    • http://nosawakudik.myartsonline.com/59603490965.pdf
    • http://jokajejuti.atwebpages.com/alexandria_egypt.pdf
    • https://uploads.strikinglycdn.com/files/c307785f-7bf6-4012-bf63-44808fea62dc/90220127360.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_off00016592.bin
2329c88a0c45367062a9988de8f78ddd3f411f5cd17996529ae28f6c73526983		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16592 5800 bytes
font_01_sfnt_off00017964.bin
8626cdc29a0d3250bce0181ad3bead907da476d40b21bf33ff7ee59cb1f65906		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17964 12592 bytes

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