Malicious PDF — malware analysis report

Static analysis result for SHA-256 2914c2a6e00278bf…

MALICIOUS

PDF

74.7 KB Created: 2021-03-03 01:50:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b6bb10dc2ab754733cdcf1025f500b8 SHA-1: acff128114349bd98671b95b1ff79feb686b2c65 SHA-256: 2914c2a6e00278bf536b949e6fdd9f6a9eb03f96183ecdf2197ef94083250222
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'https://zajinet.ru/wix?keyword=adding+pennies+worksheet', suggesting a phishing or malware distribution lure. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, but no clear textual instructions. The presence of multiple suspicious URLs further supports the malicious classification.

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://zajinet.ru/wix?keyword=adding+pennies+worksheet
    • https://cdn-cms.f-static.net/uploads/4501495/normal_5fdc113f1e431.pdf
    • http://prodive.su/wakosafykj81.pdf
    • http://bomaduworofa.medianewsonline.com/integrated_advertising_promotion_and_marketing_communications_7th.pdf
    • http://feedbacrnz.space/el_principe_maquiavelo_analisis_por_capitulos1z513.pdf
    • http://manuximaxemeje.scienceontheweb.net/wezabuwaw.pdf
    • https://static.s123-cdn-static.com/uploads/4380522/normal_5fcbd2a1f26b5.pdf
    • https://cdn-cms.f-static.net/uploads/4393488/normal_600a22b6951eb.pdf
    • http://xojuxelase.medianewsonline.com/what_tools_are_necessary_for_woodworking.pdf
    • https://cdn-cms.f-static.net/uploads/4469643/normal_60253c208ddf7.pdf
    • http://kolagozisil.mywebcommunity.org/blackbird_full_play.pdf
    • http://good-production9.site/munezuzalitepoki90j2.pdf
    • http://ig-support-service.com/26675600221mcvvo.pdf
    • https://cdn-cms.f-static.net/uploads/4446497/normal_5fd3577166249.pdf
    • http://tujemet.scienceontheweb.net/us_stock_market_live_video.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dukajevo/brothers_telugu_movie_songs_free_doregama.pdf
    • http://zejibanunepi.myartsonline.com/drinkwell_fountain_stopped_working.pdf
    • https://s3.amazonaws.com/xebuvuwov/beautiful_car_background_free.pdf
    • https://s3.amazonaws.com/satudifin/dialysis_adequacy_guidelines.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_off0000e731.bin
aae1515cf3b269363cb6561c55dcf4ce670ad0fe7bc100fe4b49accac619bf4b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE731 5124 bytes
font_01_sfnt_off0000f8b1.bin
60886fd0a4f32623307d8d48e8008e9300c67c3b478b3e14fa4b928abc60a0f8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B1 10764 bytes