Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8f197821dfcb2e…

MALICIOUS

PDF

73.5 KB Created: 2021-03-29 01:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1e27b319d995c8936d2e49cd50e3c8be SHA-1: 1269b4fa418cfb7a395f05507fb492e21aee0c94 SHA-256: 4b8f197821dfcb2ec2b8a73927eb41668191240f770d6b86bc934f5dd15987a3
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms and phishing. The primary URL, https://xajibur.ru/strik?utm_term=can+sketchup+open+obj+files, appears to be a lure to a malicious site. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://xajibur.ru/strik?utm_term=can+sketchup+open+obj+files PDF link annotation
    • https://nepuvojikonutoz.weebly.com/uploads/1/3/4/6/134677469/xulobonegekava.pdfIn PDF document text
    • https://veximukexapi.weebly.com/uploads/1/3/0/9/130969798/lagukuji.pdfIn PDF document text
    • http://bevibopo.22web.org/self_healing_concrete_seminar_report_and_ppt.pdfIn PDF document text
    • https://norabemomo.weebly.com/uploads/1/3/0/9/130969424/tirurudikul_bumebebujisiza.pdfIn PDF document text
    • https://dewufore.weebly.com/uploads/1/3/4/8/134857007/kikawonofi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://timivaferegigor.rf.gd/4027297019.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/chole_jabo_ekdin_dj_song.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/imperia_pasta_machine_assembly_instructions.pdfIn PDF document text
    • http://rurebirafana.epizy.com/kcet_2020_question_paper.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/76340888531.pdfIn PDF document text
    • https://1c514d3f-4aca-4c14-a2cc-94ef866bc6c7.filesusr.com/ugd/860217_09f2b43cf8cd4b4cbd276f35313b6687.pdf?index=trueIn PDF document text
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_7fbcc18b19e4476d85ade232b6eaed56.pdf?index=trueIn PDF document text
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_e2d130a3399a4a4db7fdfe011d8c52f0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zinudipir/military_phonetic_alphabet_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/farming_simulator_2015_ps3_cheats.pdfIn PDF document text
    • https://7b4e975e-109f-4397-a679-93e438ff1453.filesusr.com/ugd/c33f71_324e8e82b8ba419cae45168bb3a0f73c.pdf?index=trueIn PDF document text
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_1750438dba7c4bbfb5081a062b4938e3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wajibile/heat_n_glo_pilot_light_will_not_stay_lit.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/89939240609.pdfIn PDF document text
    • https://645c32c3-7e99-4959-b93b-7980205539d7.filesusr.com/ugd/30a31c_d14557c669404e1185ff931b759ca24d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jugobimuraje/the_three_estates_definition_simple.pdfIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_e1a56465b4aa4afc900c15642fbaa2ba.pdf?index=trueIn PDF document text
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_63bb2c91650549e4be78c78bb9b9e595.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CC 5192 bytes
SHA-256: 3da23e8f02bba2e1e934b28075f8c7dd4f6504ef0999159673649104b1591633
font_01_sfnt_off0000f27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27F 11568 bytes
SHA-256: bca6ef5b806071bd1ee87adcf988b326dddd74d18ac6a33c43ab2d7847e445d9

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