Malicious PDF — malware analysis report

Static analysis result for SHA-256 16690e2dd32a8452…

MALICIOUS

PDF

80.0 KB Created: 2021-03-17 05:19:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d1650ee41ba91b8ec07d0af62bd5334 SHA-1: d7f903eedf4ed0789432856242c16c62bbae10f7 SHA-256: 16690e2dd32a8452f246c1ce99a0b0366e27721784fdc307a3658237ca454bfe
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, with a primary suspicious URL pointing to 'https://druttle.ru/award?keyword=classroom+vocabulary+esl+pdf'. The document body is heavily obfuscated, but the presence of numerous external links suggests a link farm or redirection scheme designed to lead users to malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/award?keyword=classroom+vocabulary+esl+pdf
    • https://cdn.sqhk.co/waxixojapu/iggQkQ6/psb_health_occupations_aptitude_examination_study_guide.pdf
    • https://fupefodomixeja.weebly.com/uploads/1/3/4/8/134889506/worodod-seruwevabuma-ruwenakopitewut-makomozu.pdf
    • https://cdn.sqhk.co/darekomeguv/jnRhp1e/amoeba_sisters_biomolecules_worksheet_answer_key.pdf
    • https://nutarubanamu.weebly.com/uploads/1/3/4/5/134528768/a37dddee88a.pdf
    • https://cdn.sqhk.co/dulinifijal/jgvheFf/cute_hairstyles_for_medium_hair_straight.pdf
    • https://gimitowogavu.weebly.com/uploads/1/3/4/7/134746983/4b2f196.pdf
    • https://lowexupunodod.weebly.com/uploads/1/3/4/8/134896298/gimifow-fufizejega-fuvaxikidad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_9a6aca4c356a4777ab98d8bf5d9fb0f0.pdf?index=true
    • https://s3.amazonaws.com/tuxalowafokuvo/latest_covid_news_new_york_times.pdf
    • https://4dcfe184-cd6c-48f8-9f23-5461c743a1d4.filesusr.com/ugd/cc8533_f32e2932e3294dcdab2a402002b6c4e3.pdf?index=true
    • https://0e733887-fd72-4d21-8b10-0a39cafbc931.filesusr.com/ugd/1e4d10_1e45513498974a5c9fc9e3ba49df1e4c.pdf?index=true
    • http://getakufo.epizy.com/tabella_per_trasformare_i_minuti_in_centesimi.pdf
    • http://katosijuxemewex.rf.gd/88888828345.pdf
    • http://zupotid.epizy.com/diario_de_motocicleta_pelicula_completa_en_espaol_latino.pdf
    • https://0efdb04f-128a-4c0d-ace4-8b312723ebcc.filesusr.com/ugd/5508f4_affd48f1ffab4be9843b61906b72fff0.pdf?index=true
    • https://s3.amazonaws.com/tobovunoberiki/zagesukapajexasikufut.pdf
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_96258c97bccb4a10ac6ae4c4f1e46d99.pdf?index=true
    • https://ca483b97-61ac-4196-bca0-6b249c18eca9.filesusr.com/ugd/b27199_ff2be56a12914a47b6d408c223815e9f.pdf?index=true
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_5024dc6aa268457594c90e2650352732.pdf?index=true
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_315c09dfa51d49e49f293d9550b43910.pdf?index=true
    • http://juruzozesema.epizy.com/how_check_alternator_charging.pdf
    • https://0e818273-c791-4c7a-b20f-750474b78fe4.filesusr.com/ugd/362633_b61807511cca46c1b42623c016fa1682.pdf?index=true
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_932d599d5941436c9d596d8156e9b632.pdf?index=true
    • 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_off0000ee8c.bin
ae166c21f5b4b0c099ae192cf721b895d9187f2bc91f998fcbd575a0528a1118		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8C 5276 bytes
font_01_sfnt_off00010083.bin
7078007f51d52becce6ea892f453c7bfcb977f2ed4857e1519c8f65bf342c9cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10083 10632 bytes
font_02_sfnt_off000124a9.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124A9 4324 bytes

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