Malicious PDF — malware analysis report

Static analysis result for SHA-256 c99d953cc6d8f65c…

MALICIOUS

PDF

89.5 KB Created: 2021-03-17 21:31:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6705afe58423a60d69bbad3dfc45935e SHA-1: b86ffdf89dd9d9572394d8e3d2f69ece658517cd SHA-256: c99d953cc6d8f65c056ca1f4f2f8da10f4af3fc1200a75f4e36dfda4a104c714
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, designed to direct users to various PDF documents. One prominent URL, https://resalured.ru/award?keyword=bangla+book+pdf+free+download+sites, suggests a lure related to downloading books. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/award?keyword=bangla+book+pdf+free+download+sites
    • https://xoruzokuvomo.weebly.com/uploads/1/3/1/0/131070888/ruzizafowevumek_gugasubomote.pdf
    • http://jonixumuxa.iblogger.org/el_pollo_loco_salad_dressing.pdf
    • http://janurikemodowu.iblogger.org/jebikenogadazuvevuvasulu.pdf
    • https://junovolosexev.weebly.com/uploads/1/3/4/4/134467690/325617.pdf
    • https://vowagogo.weebly.com/uploads/1/3/5/3/135307183/7437417.pdf
    • https://fojaxekixuwid.weebly.com/uploads/1/3/4/7/134743661/xoboduxatasibupon.pdf
    • http://selozufuwadapuw.66ghz.com/descargar_aplicaciones_de_paga_gratis_para_android.pdf
    • https://pafodezeba.weebly.com/uploads/1/3/4/5/134589846/getojij.pdf
    • http://fafuzum.sportsontheweb.net/59325436865.pdf
    • https://nevedaroxizewav.weebly.com/uploads/1/3/4/5/134592578/2443901.pdf
    • http://juraxoxodas.scienceontheweb.net/book_of_raziel.pdf
    • http://xurivikarode.iblogger.org/gta_wasted_sound_effect_free.pdf
    • http://kafalukuwemi.mygamesonline.org/how_to_use_neato_vacuum.pdf
    • https://famereruzune.weebly.com/uploads/1/3/1/6/131637342/1319572.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xikusaduxofi.atwebpages.com/blender_video_editing_manual.pdf
    • http://wotofuwib.epizy.com/zedobo.pdf
    • http://xutakubu.epizy.com/honeywell_electronic_air_cleaner_filter_installation.pdf
    • http://xirexadugimog.atwebpages.com/advanced_excel_training_in_urdu.pdf
    • http://juvuzonowokogu.rf.gd/quote_template_free.pdf
    • http://gakajitaju.atwebpages.com/68379102795.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.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea4f.bin
18cbd48e14b0bdddd3fe71787853c7e01fbb4b751b457768aa18e28f7bc2513a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4F 5552 bytes
font_01_sfnt_off0000fd50.bin
169e9b4658ff1e2750ad871cd040392ae7e88b55c7ffa607206a39d856c5d629
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD50 17612 bytes
font_02_sfnt_off0001312e.bin
d1ba54b70dafd05825cef4264a33e1d569c159b8b0cc020c1c5b32c39031e787
pdf-font-stream PDF embedded font (sfnt) at offset 0x1312E 10824 bytes