Malicious PDF — malware analysis report

Static analysis result for SHA-256 a981ab5d0fd6d2c5…

MALICIOUS

PDF

83.6 KB Created: 2021-03-26 07:53:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 2ad3f51c0c34fcdb42c7ad4c25caecf8 SHA-1: 67d8d02970766a9bb0bf3364d7e9377476220b96 SHA-256: a981ab5d0fd6d2c5c7662e5ca4a106fb6f15e8f347bd961c4804a08274ccf3a3
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 poisoning and phishing. One prominent URL, 'https://golowaki.ru/strik?utm_term=how+to+factory+reset+samsung+galaxy+tab+4+nook', appears to be a lure disguised as a search result. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/strik?utm_term=how+to+factory+reset+samsung+galaxy+tab+4+nook PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490720/normal_601f45e4b0c85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418370/normal_60316093bac1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378161/normal_6043ddc43d6b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452382/normal_60234db280a91.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wovitiku/blender_3d_ita_gratis.pdfIn PDF document text
    • https://60ceb029-6f78-4d42-8ea4-15ca08d8077a.filesusr.com/ugd/857e61_2cec41d6f2d643c28ce62c96ce20351e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/rpg_games_free.pdfIn PDF document text
    • https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_a7126c6a51354e22bdb62c51fb19bf17.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gifiz/demeter_and_persephone_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/casio_wave_ceptor_4303_instruction_manual.pdfIn PDF document text
    • https://d73c234d-0e3d-497d-8108-d5659bace061.filesusr.com/ugd/58a813_ac02a89e38574a7fb96cb8dbf79cc599.pdf?index=trueIn PDF document text
    • https://e510c2d5-567e-4a96-89ff-abc18316baf7.filesusr.com/ugd/8a9bcc_9b5c05ee1ce24aa29ad559896b0d591d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/howard_the_alien_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/asphalt_nitro_cheats_android_1.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/adb_devices_command.pdfIn PDF document text
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_35774d54151140d99faa559f525dff77.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/47075705600.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/audacity_software_free_for_windows_8._1.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/xabetizesebaxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/660ce4e4-ca60-4681-81ac-90d2981acf93/renawutebejadosanivenoxek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25949142-1037-40f9-9e44-f1936bccced8/three_digit_subtraction_with_regrouping_worksheets_2nd_grade.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BA 5552 bytes
SHA-256: 1dc7f8f80160f7695abe674ad5371cae5dd553a33bffa16815f139a79b2b935e
font_01_sfnt_off00010cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAC 11120 bytes
SHA-256: cdecbd5cbc2af65f3bcbed43e5982efc8e75aebf19b1e378d8b51c7b9756023f
font_02_sfnt_off00013281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13281 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

Open this report in the interactive analyzer, or submit your own file for analysis.