Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcadb04217df279b…

MALICIOUS

PDF

82.2 KB Created: 2021-03-09 06:04:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9663b357dc4ce01c6a94000012c05177 SHA-1: f66f50ac6c0c7f44450d093d773098062bbe2f15 SHA-256: bcadb04217df279b2797ae802f4e1f3b4d01cfd3057e4d399fe719c59e82f008
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, with a critical heuristic identifying it as a PDF link farm. The primary URL, https://vilenefex.ru/wb?keyword=great%20dane%20and%20pitbull%20mix%20puppy, and another suspicious URL, http://fastcreditcheck.info/sorutotawetedawevarefurifvncm.pdf, are indicative of malicious intent. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely used 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-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://vilenefex.ru/wb?keyword=great%20dane%20and%20pitbull%20mix%20puppy
    • http://fastcreditcheck.info/sorutotawetedawevarefurifvncm.pdf
    • https://farenutatovepo.weebly.com/uploads/1/3/4/5/134502273/konosuwalevuf-zamav-mimatepamonuxe.pdf
    • http://feelslike35.com/808745933346po1b.pdf
    • https://guxuperotasase.weebly.com/uploads/1/3/4/3/134311101/tixigusitaraguvanowa.pdf
    • https://nolemidu.weebly.com/uploads/1/3/4/5/134584078/rezored.pdf
    • https://cdn.sqhk.co/bezakebijuk/hbhfLzc/wink_emoji_meaning_urban_dictionary.pdf
    • http://begetus11ppz.xyz/planeacion_estrategica_idalberto_chiavenato_tercera_edicion_gratisudlbm.pdf
    • https://cdn.sqhk.co/lutakakijuro/j0hbiji/ruzukesufulopalasizefo.pdf
    • https://kuxaxamolexude.weebly.com/uploads/1/3/4/8/134869233/4690880.pdf
    • https://wimelavejitovuv.weebly.com/uploads/1/3/4/5/134597731/c50de52d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/96b36be6-d3b7-421c-8d29-8e50d61d43ec/what_causes_red_eye_in_the_morning.pdf
    • https://uploads.strikinglycdn.com/files/da4a202f-b50d-4c7b-942b-efc2b590cb72/62686636771.pdf
    • https://uploads.strikinglycdn.com/files/aa104cc1-4845-4d85-b5e5-5e4bb5d5db9d/39291927215.pdf
    • https://uploads.strikinglycdn.com/files/0590a6de-ed01-40df-b439-7444e8b24d14/texeduxurimiw.pdf
    • https://uploads.strikinglycdn.com/files/8e67feed-63f5-4dc5-bbdb-e2ff2d871dc1/siwavevasabimawopezasoxib.pdf
    • https://uploads.strikinglycdn.com/files/2a480b0b-e312-433c-bdc4-4b27e443b095/how_many_times_can_you_take_the_arrt_exam.pdf
    • https://uploads.strikinglycdn.com/files/d68dbf46-1532-4e66-9bcd-57de5b06db6c/flotec_pump_keeps_running.pdf
    • https://uploads.strikinglycdn.com/files/3df65736-58ac-4d4b-ac72-994ea8ec58a1/ejercicios_de_notacion_cientifica_para_7_basico.pdf
    • https://uploads.strikinglycdn.com/files/57c3b031-5397-4074-94df-83cc291018a0/tabla_valores_z_distribucion_normal_estandar.pdf
    • https://uploads.strikinglycdn.com/files/6b336bb4-ef35-48fd-aaca-236823a0a316/the_6th_and_7th_book_of_moses_part_2.pdf
    • https://uploads.strikinglycdn.com/files/ac83ef9b-af8a-4775-9fd0-0be267d5ac60/gotalepekif.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_off0000f8d3.bin
559fff83ca5f36fe2f75c81a2fd9689846fff12316ca229bfea74d8cd45c7870		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D3 5040 bytes
font_01_sfnt_off000109dd.bin
86a1dd25588a2d41c6dce782e3e265c132eecbcb42eea254c0c22035a671a1be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109DD 10180 bytes
font_02_sfnt_off00012cc7.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC7 4324 bytes

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