Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e33a3c45a60d301…

MALICIOUS

PDF

83.8 KB Created: 2021-05-10 19:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 636f276cbffba99c494726dbbe1c3759 SHA-1: 74154c6f43bdf36210d2c8fa103ceea589e8ebc6 SHA-256: 5e33a3c45a60d301dc1528f28b6404b870893f0b8fb07655d4f4cad3b1a8c983
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files hosted on file-sharing services, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to redirect users to malicious sites, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/strik?utm_term=how+to+use+the+singer+walking+foot
    • https://seporulakokifo.weebly.com/uploads/1/3/4/5/134590723/196945.pdf
    • https://nabokopawupanav.weebly.com/uploads/1/3/0/7/130739772/7923888.pdf
    • http://ourfutures.space/m._u._d_rally_racing_mod_apk_downloadnrs0c.pdf
    • https://widosutolitidaf.weebly.com/uploads/1/3/4/8/134847614/piwuvojinojexiwi.pdf
    • http://biomaniix.website/android_chat_application_using_xmpp89sn1.pdf
    • https://limopepubev.weebly.com/uploads/1/3/4/6/134627214/zasavusob.pdf
    • https://sozuxope.weebly.com/uploads/1/3/4/8/134873608/8599077.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • http://www.daltonmaag.com/
    • https://3f7ff619-1e23-491c-a925-ddda4d79b49c.filesusr.com/ugd/79c22a_ae402c73d26f49e98b685a7edab4c8b1.pdf?index=true
    • https://82c1a4a6-0aea-44ab-842b-07cb5bdde860.filesusr.com/ugd/aafee9_618f85bcf80a44a2b0fd9da8f8b9c4fb.pdf?index=true
    • https://s3.amazonaws.com/gebukil/elementary_number_theory_by_burton.pdf
    • https://4095172d-bd2f-4181-91d7-dd424e653400.filesusr.com/ugd/df73ab_68b592d526ce40699a50fd2ed6b50870.pdf?index=true
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_4c7c6104c2184b0f94f85679d83072e4.pdf?index=true
    • https://s3.amazonaws.com/vufupu/installare_cestino_su_android.pdf
    • https://s3.amazonaws.com/bipepezuwed/hvac_electrical_symbols_chart.pdf
    • https://s3.amazonaws.com/zalomi/70074688986.pdf
    • https://s3.amazonaws.com/purixifusipelid/21210483329.pdf
    • https://s3.amazonaws.com/bufipevuril/disney_caribbean_beach_resort_map.pdf
    • https://c5c27394-2042-4749-9b39-d1c24dcbd9f0.filesusr.com/ugd/e9b987_49df708df5454d76a02f0f30f6db993d.pdf?index=true
    • https://s3.amazonaws.com/memexelu/baitarani_lo_baitarani_odia_bhajan.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee1e.bin
86faac5cedb3a40e2e74b05e764ba893e321d0c975a23d7fcfac27aacdf649f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1E 5028 bytes
font_01_sfnt_off0000ff31.bin
a397c99fba0e47a5823b98702d751ffcad5d714ce329e5ad92c3da3ea2ddfcaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF31 6124 bytes
font_02_sfnt_off00010f1a.bin
4c2647192f9eedf77ca0ffc4a20b695c9f1cc54691ebc2b764e387f6a04976f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1A 10532 bytes
font_03_sfnt_off00013316.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13316 4324 bytes

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