Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d5016581359d1ee…

MALICIOUS

PDF

73.9 KB Created: 2021-06-08 06:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f987a4c02f20e4629107d2a368431f54 SHA-1: d2ba950ab9540007ce86769146b115b451626492 SHA-256: 8d5016581359d1ee0367f370f891da1c1072baa480c8bcb4175a704980cef9d7
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, identified as a link farm, with the primary URL suggesting a lure for purchasing or downloading books. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially harmful content.

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://queure.ru/pbw?utm_term=buy+ged+book+online+download
    • https://cdn-cms.f-static.net/uploads/4402478/normal_60bc63e428134.pdf
    • https://zepazilarewar.weebly.com/uploads/1/3/4/3/134310653/gezozefojeradom.pdf
    • https://static.s123-cdn-static.com/uploads/4471711/normal_5fe040dff2e0a.pdf
    • https://bojozavo.weebly.com/uploads/1/3/0/7/130740433/ef4f528.pdf
    • https://wetegawufuju.weebly.com/uploads/1/3/5/3/135302163/zamokisik-mudurar-vapivipolib.pdf
    • https://static.s123-cdn-static.com/uploads/4454289/normal_5fec906cbf199.pdf
    • https://voganesabif.weebly.com/uploads/1/3/1/1/131163538/ruwaliga.pdf
    • https://cdn-cms.f-static.net/uploads/4369502/normal_601b7cd27a8f4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/2dc2cfc1-5174-4bd6-9186-b7a2570f6eef/fojaxevatofetedi.pdf
    • https://uploads.strikinglycdn.com/files/dee99b80-8a10-4b99-a84d-0978ef5c116a/junji_ito_tomie_manga_sub_indo.pdf
    • http://vifogajo.pbworks.com/w/file/fetch/144517959/cuanto_vale_un_pie_en_metros.pdf
    • http://risuxujuvu.pbworks.com/f/le_prsent_des_verbes_en_er_ce2_exercices.pdf
    • http://bezagodo.pbworks.com/w/file/fetch/144667983/rurox.pdf
    • http://xibosini.pbworks.com/w/file/fetch/144761325/minecraft_hack_client_1.16.4.pdf
    • https://uploads.strikinglycdn.com/files/92556a5a-46cd-4997-ad67-c67aa33786ad/how_do_you_find_the_magnitude_of_the_normal_force.pdf
    • https://uploads.strikinglycdn.com/files/e57fb1de-116a-4e35-8803-53850a7f4f7f/how_to_explain_the_trinity_to_a_jehovah_witness.pdf
    • https://uploads.strikinglycdn.com/files/a355d2aa-d3f2-4bb3-9015-08fa50f145e1/the_grape_cure_book.pdf
    • https://uploads.strikinglycdn.com/files/af7be7ba-7b8b-4439-867b-8d74e0bd0a46/bodyweight_exercises_to_build_muscle_at_home.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d864.bin
bd72e17ebc5f35ef348df6072254f1b26fc904a701658111461427c6335b1dff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD864 4968 bytes
font_01_sfnt_off0000e96b.bin
c190aa0788a3b340d1ca843dd26836c0bbd7facd93c61ec3a7bc217e9f303f39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE96B 10376 bytes
font_02_sfnt_off00010c66.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C66 4324 bytes

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