Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a130c1a31d9f509…

MALICIOUS

PDF

118.4 KB Created: 2021-05-14 15:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 763113f316bf4081726015dc8a0cdbb4 SHA-1: 6e1944b75dcd992fa7a36b5f6465fc92ff233b78 SHA-256: 0a130c1a31d9f50960be99a8737b2d863bdd4f75e92fa2fa7242c6f13f607a78
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 a link farm. One of the primary external URIs, 'https://kuzutuzo.ru/strik?utm_term=language+files+12+answer+key', is flagged as suspicious and likely serves as a lure for phishing or malware. Although no scripts were directly extracted, the PDF structure and the presence of external links suggest an attempt to redirect users to malicious content, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9872

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://kuzutuzo.ru/strik?utm_term=language+files+12+answer+key
    • http://ketoxitigojaluk.sportsontheweb.net/the_microkinetics_of_heterogeneous_catalysis.pdf
    • https://xovadesunuzavam.weebly.com/uploads/1/3/4/4/134479636/zibobosesi.pdf
    • https://bekobivovovezu.weebly.com/uploads/1/3/4/6/134608345/morevetipebo.pdf
    • http://dasazopemobor.mywebcommunity.org/83499661582.pdf
    • https://mubasaji.weebly.com/uploads/1/3/4/8/134846322/697cf7a.pdf
    • http://gixodugesu.medianewsonline.com/mario_vargas_llosa_libros_gratis.pdf
    • https://pewatusikowago.weebly.com/uploads/1/3/2/6/132683224/lefubinasazotaf_bewerataxesizef_jexutapegun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_0ea8f0ea3ee24ba8b1647fb80abd8397.pdf?index=true
    • https://uploads.strikinglycdn.com/files/dff2a2b5-06a6-4ba8-88eb-e3994f031c32/macbeth_act_3_multiple_choice_quiz.pdf
    • https://uploads.strikinglycdn.com/files/ba49c10d-1a7a-48e5-9642-dd1f77a5c094/paxarozigimeva.pdf
    • https://uploads.strikinglycdn.com/files/80b40022-3223-4ede-aa6e-996abe386221/rizunamejusirafe.pdf
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_daea405414524edba2230998db739ec5.pdf?index=true
    • https://332892e0-6a2b-40ad-946e-e7c92c61c867.filesusr.com/ugd/3e5d97_dec66caca0c943bbbad72fbf7250c0cc.pdf?index=true
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_1f4c069b900c4609af28fe37910f51f4.pdf?index=true
    • https://dca540c6-954d-4243-9f09-0921753db957.filesusr.com/ugd/974a4e_f347153e346d4c76a9340073e6ef6e1a.pdf?index=true
    • http://pumikowexudat.onlinewebshop.net/libro_rojo_auditoria_interna.pdf
    • https://67dc9804-4028-4298-afd7-d431d2c16fe6.filesusr.com/ugd/559c84_75ae080647604be8b943eee7d7f7dcf2.pdf?index=true
    • https://4407eba0-147d-4e9d-98ff-19010b67f466.filesusr.com/ugd/c1f2fd_b82242e67784455b9029947eb491f0c3.pdf?index=true
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_946f309572374e01aec0081d2fb63a1d.pdf?index=true
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_18f84cc3e901467588fc418f094e9ded.pdf?index=true
    • https://bff5fdab-9fd0-4670-908b-a1308bb5a9cb.filesusr.com/ugd/227d0f_954915e7e87247b7affe80b4801be421.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0af2e718-27af-4553-9a9f-fd3b74b23ed1/hindi_alphabet_full_video.pdf
    • https://95c758d6-fd33-43c6-b5d0-f1f55e07e946.filesusr.com/ugd/cb0188_79a83304a38442c4bfb0b48048eaf8c3.pdf?index=true
    • https://b7af6bb9-01eb-4839-ab56-764651de4344.filesusr.com/ugd/2486b5_52fab745c4974d929792aa70454dbe80.pdf?index=true
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_60a05c31507542ef8e69c58097d4733f.pdf?index=true
    • https://0f0532cb-4478-41f9-91a1-cf277c4732ec.filesusr.com/ugd/8acad3_9e90981b01fc482d869c0077c1a1707c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f8ea8951-12e5-40fc-9726-387c7f6f9edc/how_to_rhyme_rap_lyrics.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_off0001807a.bin
65e92bfea3e26bcc676b28ea5d56c2b79dec4b0cb5e8ff5d23646f3ca63c6c4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1807A 5012 bytes
font_01_sfnt_off000191ad.bin
40a84ebfdb43f42856652a9f8c5c44750c59aeb489a6cb81997807beea31cd3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x191AD 12544 bytes
font_02_sfnt_off0001bb32.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB32 4324 bytes