Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4cef54bb75efe7a…

MALICIOUS

PDF

67.4 KB Created: 2021-03-16 12:53:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff880207912cdedf5668eda6c1d3f411 SHA-1: 7ae92f74870817ad68c8cfcb612268d551fc0609 SHA-256: a4cef54bb75efe7a95a0cf0eb76a06d7d4b79ca95b7c535b5b696b117c47a9ab
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an external URI pointing to 'https://xajibur.ru/123?utm_term=vote+for+me+poster+template', which is likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed to host numerous links on disposable domains, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?utm_term=vote+for+me+poster+template
    • http://jefofonem.iblogger.org/dodap.pdf
    • http://bizuzagewad.iblogger.org/61155430075.pdf
    • http://pozezan.mygamesonline.org/debofiv.pdf
    • http://nijepatexosanus.medianewsonline.com/cells_alive_worksheet_answer_key_free.pdf
    • http://fuzefimovogavi.22web.org/carmen_overture_piano.pdf
    • http://korefubelexusiz.medianewsonline.com/wadidirifuwiwojijopomowu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kedenutorufet.rf.gd/38338707756.pdf
    • https://s3.amazonaws.com/napoledunadigo/chirutha_audio_songs_in_telugu.pdf
    • https://uploads.strikinglycdn.com/files/9dd27ce3-c923-4f06-9481-438b87fc0475/78507040335.pdf
    • http://dubabin.rf.gd/juniper_jtac_guide.pdf
    • https://uploads.strikinglycdn.com/files/8acd519d-e083-4f1a-a981-e19af9bdab47/transformer_sizing_calculation_as_per_iec.pdf
    • https://s3.amazonaws.com/jeromopelurab/bogasimazanasugalokav.pdf
    • https://uploads.strikinglycdn.com/files/a0ce4c21-b089-4896-97e1-f9ad58aabb68/55644326150.pdf
    • http://tivurazug.rf.gd/fimekeduxukexojomamino.pdf
    • https://uploads.strikinglycdn.com/files/a51554be-0bf4-447a-a53f-f40154ff75a6/lista_tascn_excel.pdf
    • http://junedujivoxoz.epizy.com/zawusebokizi.pdf
    • http://nudenagazosizav.epizy.com/wizodozivaka.pdf
    • http://laxolivavaru.epizy.com/97592153180.pdf
    • https://s3.amazonaws.com/tugumeb/nevupowode.pdf
    • http://mudotepejix.epizy.com/41114190370.pdf
    • http://dejarovagozude.epizy.com/veziwirotitok.pdf
    • http://pidusagi.atwebpages.com/taxi_driver_translation_in_spanish.pdf
    • https://s3.amazonaws.com/nuxulikiwab/puvope.pdf
    • http://beranaja.epizy.com/espen_guideline_clinical_nutrition_in_surgery_espaol.pdf
    • https://uploads.strikinglycdn.com/files/c3fab47d-60dc-41d7-b288-63026e4f1571/to_shoot_an_elephant_film.pdf
    • http://liwituro.epizy.com/wewobagazoratejigopupak.pdf
    • http://zitulogakapede.myartsonline.com/toro_super_blower_vac_directions.pdf
    • https://s3.amazonaws.com/jadudusujuje/charles_bukowski_reading_poems.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd77.bin
f1da273e9a07630f0b526932ad5ef4a5372e54dfece43ed9235aa921c23ef2e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD77 5012 bytes
font_01_sfnt_off0000de6f.bin
4e6933b30756639bb8980ef9747b25133cfbdcee27363c561754016b908944ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6F 9944 bytes

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