Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b99d1613eb78678…

MALICIOUS

PDF

74.5 KB Created: 2021-03-20 20:21:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 815b0a8c38814f4b84bc638e52dd96a6 SHA-1: 80dc0964fe62793738890ad44680bfa6bc6544dd SHA-256: 9b99d1613eb78678c4ade652a4d71bf5d5eb6bcf594c5b2f86f77a17e8e037c6
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains an embedded URI pointing to 'dafemum.ru', suggesting it is used to redirect users to a potentially malicious site. The document body, though heavily garbled, contains keywords related to technical diagrams, likely a lure to disguise the malicious nature of the link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/award?keyword=tda2020+amplifier+circuit+diagram+pdf
    • https://cdn-cms.f-static.net/uploads/4392877/normal_600df176c759c.pdf
    • http://fomijegi.mypressonline.com/how_to_reset_a_maytag_bravos_x_washer.pdf
    • https://cdn.sqhk.co/zutujodara/heijhiF/84849220149.pdf
    • https://vudefuzafovafid.weebly.com/uploads/1/3/4/6/134630521/a45475e8.pdf
    • https://cdn.sqhk.co/neratimo/X0jfVhj/brabantia_perfect_flow_ironing_board_124_x_54.pdf
    • https://cdn-cms.f-static.net/uploads/4469630/normal_6032e349eac1e.pdf
    • https://zexamedoguko.weebly.com/uploads/1/3/1/4/131454027/8306099.pdf
    • https://static.s123-cdn-static.com/uploads/4485714/normal_5fe1e9a3f3e96.pdf
    • http://wogivodugakovek.mygamesonline.org/fasoride.pdf
    • https://cdn.sqhk.co/pirujezexod/ggjiHji/33269583004.pdf
    • https://cdn.sqhk.co/dufolatik/jdjhbgf/55692637751.pdf
    • https://xobojurum.weebly.com/uploads/1/3/4/5/134599739/givobetum_sonumokexu_jipotoxod_dogibafotod.pdf
    • https://sujofunipus.weebly.com/uploads/1/3/4/5/134502209/872493.pdf
    • https://cdn.sqhk.co/nuzifixe/gcig1dl/mupipa.pdf
    • https://cdn-cms.f-static.net/uploads/4384164/normal_60305ab627c99.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zawuzujuw.epizy.com/3329753512.pdf
    • http://menivafanar.epizy.com/5861538828.pdf
    • http://levapoloj.onlinewebshop.net/what_is_the_sales_tax_rate_in_plano_texas.pdf
    • http://pibesavifa.epizy.com/gubunuxelomimugitugizavij.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_off0000e66c.bin
8a75a03c6983a3da2ddcaeb6709a521f4544dc163475d491186850d81003fa48
pdf-font-stream PDF embedded font (sfnt) at offset 0xE66C 5520 bytes
font_01_sfnt_off0000f919.bin
338d633456b5f19c1a4a1809a0c3cd1b8c06dbf2af15c5a8a9e157105551610e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF919 10296 bytes