Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eb1069c2abf9f98…

MALICIOUS

PDF

74.3 KB Created: 2021-03-20 15:22:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 859727b220969b04dee6e180524fb50a SHA-1: 92749958b7e9f25a7fdd5894b496c5acd30ca6a5 SHA-256: 8eb1069c2abf9f98e703956b5131bbb30f7791626226af35dc8eb4a81b5a2f54
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external URIs points to 'resalured.ru', a domain associated with malicious activity. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/123?utm_term=name+caller+tune+jio
    • https://cdn-cms.f-static.net/uploads/4374372/normal_60291d07456f4.pdf
    • https://static.s123-cdn-static.com/uploads/4500692/normal_5fe3db35904ff.pdf
    • https://cdn-cms.f-static.net/uploads/4389387/normal_6015c4744327b.pdf
    • https://webuwoterin.weebly.com/uploads/1/3/4/5/134589655/c7e5a36.pdf
    • https://vujojetusifej.weebly.com/uploads/1/3/1/3/131398487/dimosel.pdf
    • https://vijapuloxo.weebly.com/uploads/1/3/0/7/130775263/zujiwuropilerakoxo.pdf
    • https://juvivufoli.weebly.com/uploads/1/3/5/3/135325295/fb12b6.pdf
    • https://cdn-cms.f-static.net/uploads/4390052/normal_604cd3669ab56.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wutisigila/emulator_for_gba_classic_games_apk.pdf
    • https://s3.amazonaws.com/defujo/2011_ram_quad_cab_bed_length.pdf
    • https://uploads.strikinglycdn.com/files/da9cc677-ed26-4fac-902d-3201282279f4/factory_reset_att_cordless_phone.pdf
    • https://s3.amazonaws.com/nevowimo/sportcraft_7ft_turbo_air_hockey_table.pdf
    • https://s3.amazonaws.com/pekatikisuruki/how_to_make_a_pimple_on_your_lip_go_away.pdf
    • https://s3.amazonaws.com/vufuzewasi/51088377044.pdf
    • https://uploads.strikinglycdn.com/files/1a39b3a0-bb9f-4379-8a5e-261382734ca1/xaravolewarakebex.pdf
    • https://s3.amazonaws.com/fevobelijogal/vigukobefatemogubu.pdf
    • https://s3.amazonaws.com/mivokozibu/charlie_malayalam_movie_masswap.pdf
    • https://s3.amazonaws.com/muvemasoxaji/parts_of_speech_worksheet_with_answers.pdf
    • https://uploads.strikinglycdn.com/files/2b544eeb-cc37-4d8b-8e41-c2964daf0490/7808779252.pdf
    • https://s3.amazonaws.com/ragejufa/annals_of_nuclear_energy_latex_template.pdf
    • https://uploads.strikinglycdn.com/files/7f534a5f-c04e-46b6-9711-eb1cd7f46cdc/wezumupapo.pdf
    • https://uploads.strikinglycdn.com/files/b48033bb-4970-480d-99ce-95ad0d0b4e24/technical_analysis_explained_by_martin_pring.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_off0000e772.bin
be5312e9fee3983c4a9da6ddf8a2ebd10c5b8533ab01f8037d62b1ae97c24ca4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE772 4812 bytes
font_01_sfnt_off0000f7c1.bin
4648cda623a32a7ed7b74bea76bd0f3a38c26b8cf912ed38ef0f49a2e10aeb39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C1 10696 bytes

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