Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8ef4af4ff00aa7…

MALICIOUS

PDF

90.9 KB Created: 2021-03-19 04:01:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f35a97bc65d386f1d4c8c60a2e4b324 SHA-1: ea507a2498998cfe57f2af82aab4960dcc47fa25 SHA-256: 5d8ef4af4ff00aa7d3da56c43fcd14611b234210dde981be7ccdbc40eb3e63f1
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, and is flagged by ClamAV as a phishing trojan. The document body, though partially corrupted, suggests a lure related to literary analysis, likely to entice users to click on the embedded malicious URLs. The presence of external links and the ML classifier's high confidence score indicate a strong likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://jumiwimov.ru/strik?utm_term=descripcion+psicologica+de+los+personajes+cronica+de+una+muerte+anunciada
    • https://cdn-cms.f-static.net/uploads/4450139/normal_6045008cf3df6.pdf
    • http://xelasurugopu.mywebcommunity.org/22443926185.pdf
    • https://cdn-cms.f-static.net/uploads/4459322/normal_6049859a0d7f1.pdf
    • https://cdn.sqhk.co/wevujawej/gXejhjd/jenitisefakuxuzi.pdf
    • http://kemytbok.xyz/53473173513bqwni.pdf
    • https://cdn-cms.f-static.net/uploads/4390057/normal_6017775b49698.pdf
    • https://dajexuxeguse.weebly.com/uploads/1/3/4/8/134859846/gezale_goponixasemegus_zasuxatunu_zigigegevule.pdf
    • https://javimitama.weebly.com/uploads/1/3/4/3/134349319/sawegulujixizasas.pdf
    • https://cdn-cms.f-static.net/uploads/4475000/normal_601b52685cb05.pdf
    • https://static.s123-cdn-static.com/uploads/4426545/normal_5ff6b8f085814.pdf
    • https://boxijobanopuvob.weebly.com/uploads/1/3/0/7/130739783/85f0a76d82dff.pdf
    • https://cdn.sqhk.co/rarinuva/hifRmge/wobudizarebigizojebafeka.pdf
    • http://itdiscounts.pro/volar_sobre_el_pantano_descargar_libro_completoxsidi.pdf
    • https://cdn.sqhk.co/jozazixefuf/eiciegj/zunagatakefoz.pdf
    • https://cdn.sqhk.co/sapidefapo/yhhiabC/kuvutesotozataxazoxivov.pdf
    • https://cdn-cms.f-static.net/uploads/4424996/normal_6040735884b7f.pdf
    • https://cdn-cms.f-static.net/uploads/4477921/normal_604907b1012d8.pdf
    • https://boxorefo.weebly.com/uploads/1/3/0/9/130969922/joradoxo_sozuzowaji_fotar_kikukada.pdf
    • https://cdn-cms.f-static.net/uploads/4499309/normal_601ab3d0e7c5e.pdf
    • https://cdn.sqhk.co/notenirikev/gikgchi/fovokepekowosinibekar.pdf
    • http://zokidinodajives.getenjoyment.net/77988184062.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • http://sasukagisodubex.onlinewebshop.net/24788467825.pdf
    • http://mijovutotukedes.onlinewebshop.net/download_conexant_high_definition_audio_driver_windows_7_64_bit.pdf
    • http://batapijas.myartsonline.com/abruptio_placentae.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
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111b2.bin
b350918f5284d1fe7165117f240567fd17bc7d1524047605644bc87c66c5a810		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111B2 5468 bytes
font_01_sfnt_off00012436.bin
d2d10b6b0c668cf26faa9347c7054f8580c7eefa5cb7aecda2a4fba74bd025f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12436 6068 bytes
font_02_sfnt_off000133e7.bin
69b7e76f85dea6330ec31c9fb19544bb14a1a56add5cfef046ebdd476b1bb1fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133E7 11984 bytes

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