Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f27a98a8dbf4035…

MALICIOUS

PDF

85.2 KB Created: 2021-06-09 04:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f3012b9daf291377b4e53b1eabd35e5 SHA-1: 78ad0786190d38213a9b28792d8ce94532d387b8 SHA-256: 9f27a98a8dbf403551b1fac7e5aa76191b534a327f2271f6be9fb8a838e66e27
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains heuristics indicating an embedded URI pointing to a URL that mimics a search result for a downloadable PDF. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The primary IOC is the URL used in the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://medvor.ru/pbw?utm_term=sura+tamil+guide+for+10th+download+pdf
    • https://ledagesobefe.weebly.com/uploads/1/3/4/3/134367542/246336.pdf
    • https://cdn-cms.f-static.net/uploads/4415934/normal_600b14c00a11a.pdf
    • https://dadotetixaj.weebly.com/uploads/1/3/4/4/134404583/lavubekovalujoj_kirokolot_bifejeg_pofakiwegavuzu.pdf
    • https://noparerekum.weebly.com/uploads/1/3/4/6/134639333/907816.pdf
    • https://gawajofanobovap.weebly.com/uploads/1/3/5/2/135296378/vabitipuzajun_dajenugamitevi_fugeguxokux.pdf
    • https://static.s123-cdn-static.com/uploads/4491925/normal_6003d42c6bf7d.pdf
    • https://static.s123-cdn-static.com/uploads/4446937/normal_5fec1c872f5b4.pdf
    • https://vakexojukesazi.weebly.com/uploads/1/3/0/9/130969985/nanim.pdf
    • https://cdn-cms.f-static.net/uploads/4493579/normal_60582b3f8397d.pdf
    • http://fedorahosted.org/lohit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bevojoluvu.pbworks.com/f/gizukilogometege.pdf
    • https://uploads.strikinglycdn.com/files/504db684-cc85-4714-98f3-c4fe58d51266/how_to_use_kobalt_12_miter_saw.pdf
    • http://nadupodifado.pbworks.com/w/file/fetch/144832479/free_ks3_comprehension_worksheets.pdf
    • http://bevojoluvu.pbworks.com/w/file/fetch/144447648/how_to_get_muscular_thighs_without_equipment.pdf
    • https://uploads.strikinglycdn.com/files/b614a6e7-9532-4c4e-afd8-469ccb093928/52775247074.pdf
    • https://uploads.strikinglycdn.com/files/71b7ff92-1d6c-40b7-91ec-323c1b65810f/does_the_outsider_have_a_sequel.pdf
    • https://uploads.strikinglycdn.com/files/9c93eba7-3afb-4346-9d59-efaf98cac1a8/sefubanesaruzut.pdf
    • http://kusarolox.pbworks.com/w/file/fetch/144557826/what_do_i_do_if_my_firestick_remote_wont_work.pdf
    • http://mikabipi.pbworks.com/f/28093143871.pdf
    • http://sujabuno.pbworks.com/f/cheesy_pickup_lines_for_him_in_spanish.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
stream_003_off0000fb13.bin
9fe27a686fa5b131534f6cae5fefa9fa83280141fcf636546b8920826a568dd7		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFB13 18520 bytes
font_00_sfnt_off0000e7e1.bin
343bcb47f0b91095799b9f9c9752cafdaec0b9c3acaf7af23f6ac501e9740618		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E1 5668 bytes
font_02_sfnt_off00012381.bin
c10784a4c985e9a8cecc0038967e042f33dfedfcd91f5c8555c35f2a2c3e971f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12381 10488 bytes

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