Malicious PDF — malware analysis report

Static analysis result for SHA-256 319db25e63d37c81…

MALICIOUS

PDF

90.8 KB Created: 2021-03-20 03:30:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2a7a5b4d8362ad124335c3ed6185d5b SHA-1: d0374938ebc10ef6e6fc6f25a8886dc0d7daec6a SHA-256: 319db25e63d37c81da1bd01cc5eb7b276f087a756c8216af001c9c012534a1b6
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of an embedded URL pointing to 'ponafet.ru' and a heuristic firing for a 'download button' suggest a phishing or social engineering attack. The document body, though heavily obfuscated, contains keywords related to 'banking awareness' and 'pdf', potentially used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ponafet.ru/award?keyword=arihant+banking+awareness+2020+pdf
    • http://meriline.store/what_to_ask_when_taking_over_a_businessmbvz2.pdf
    • http://zexaribamemavi.sportsontheweb.net/51091183377.pdf
    • https://cdn-cms.f-static.net/uploads/4450037/normal_5fd780f5b91cd.pdf
    • https://cdn-cms.f-static.net/uploads/4463807/normal_5fd641976d2cd.pdf
    • http://parrrtner.xyz/gefipagoluwifosowulafuni4r3q.pdf
    • https://cdn-cms.f-static.net/uploads/4486982/normal_603706c800250.pdf
    • http://fikakutipid.mygamesonline.org/pete_the_cat_school_shoes_story.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://s3.amazonaws.com/kikunojulejuj/6999050493.pdf
    • https://s3.amazonaws.com/xezonijida/best_prices_on_kitchenaid_stand_mixers.pdf
    • https://s3.amazonaws.com/kubedukowug/79273934409.pdf
    • https://s3.amazonaws.com/bajapovogam/undertaking_letter_format_for_employment_visa.pdf
    • https://uploads.strikinglycdn.com/files/8503f82d-b597-407b-8309-680b834eea35/robin_hood_disney_prince_john_arrives.pdf
    • https://s3.amazonaws.com/xasovewipeje/daily_nation_news_paper.pdf
    • https://s3.amazonaws.com/sesijesule/absceso_periodontal_en_nios.pdf
    • https://s3.amazonaws.com/xelimewat/sap_erp_6._0_ehp6_installation_guide.pdf
    • https://s3.amazonaws.com/tabobujimo/bottomsheetdialogfragment_rounded_corners.pdf
    • https://uploads.strikinglycdn.com/files/566c998e-f715-4d9f-9f31-61532bcfa2a6/tebogizinesumifavew.pdf
    • https://uploads.strikinglycdn.com/files/ad5b5320-2b8b-4b67-a835-ed22b1e8afc4/how_can_i_strengthen_my_back_without_weights.pdf
    • https://s3.amazonaws.com/wujixus/50803388708.pdf
    • https://uploads.strikinglycdn.com/files/86260e94-5db9-407c-9a23-545aaf574ded/22829495157.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f831.bin
091e77ce223d7a6a4a37bb444afce9ee7f7e99f995ad9225e4060b23498cb909		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF831 5828 bytes
font_01_sfnt_off00010c0d.bin
6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0D 3720 bytes
font_02_sfnt_off00011770.bin
1a54d36d0e403b203d89ada4df997e92e3b678c7a6e6cf231ddf254990f99873		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11770 11572 bytes
font_03_sfnt_off00013e0d.bin
f4baa163836ff58469489a310d5e9fd0bfce3a3a9fa757934ae2f35428eb3d0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E0D 9796 bytes

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