Malicious PDF — malware analysis report

Static analysis result for SHA-256 657027bb19ee5a7d…

MALICIOUS

PDF

86.6 KB Created: 2021-03-20 20:04:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e3b9def7323f49089de08cc4aed7d13 SHA-1: 4ba24e3b83b6c72ca335f9f7b3ac0f531fabab05 SHA-256: 657027bb19ee5a7d938998ad109ba7e165b2c07d5a59d0dc13352f73284bdfe8
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to Weebly and other file-hosting services, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate the document's primary purpose is to redirect users to potentially malicious websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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-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://seumenha.ru/wix?keyword=world+conqueror+4
    • https://libirobu.weebly.com/uploads/1/3/5/3/135336219/9188828.pdf
    • https://napuvenorabinu.weebly.com/uploads/1/3/4/4/134490891/a89cc3afec.pdf
    • https://cdn.sqhk.co/sarunasol/1rhcigq/thorogood_boots_sizing_reviews.pdf
    • https://pidowiwosuzaji.weebly.com/uploads/1/3/0/9/130969191/nugirazo.pdf
    • https://cdn.sqhk.co/lomokubaf/lMLgdDr/zombie_hunter_post_apocalypse_mod_apk_hack.pdf
    • https://cdn.sqhk.co/bofotabi/yidggnI/foneganiwa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_0e17d727b64b4c68855f0339eab4f538.pdf?index=true
    • https://9fbaa0db-fe9e-443e-b503-3d02ea494c21.filesusr.com/ugd/d417e9_e4cf6b6494444bc3a1d815508df8f88f.pdf?index=true
    • https://s3.amazonaws.com/wapabefizosumi/puzzle_bubble_shooter_game_free.pdf
    • https://s3.amazonaws.com/sefukirexuwekij/100s_chart_interactive.pdf
    • https://s3.amazonaws.com/tolivajupeku/how_to_put_two_points_into_point_slope_form.pdf
    • https://46fb9a51-9e16-4ad8-811e-2f7ed01702f7.filesusr.com/ugd/53363c_6035e1d3b40d4737bfd8c1a8e3f4b74d.pdf?index=true
    • https://acfc0e76-311d-46af-9c13-f46c112eb424.filesusr.com/ugd/f90bad_fd94270b2f974e7bb137197a43a1002b.pdf?index=true
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_17715bf8988e4ffe9fffbd51eed016b9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/53a530b4-5166-4c8d-bf47-815fbafe1f9f/fowogudibanovigesuzob.pdf
    • https://7f3dc8b3-869c-44c5-82eb-14ae88d57796.filesusr.com/ugd/dc4ca1_8b6d5d583baf4a31bfcdbbb447f7b445.pdf?index=true
    • https://s3.amazonaws.com/zafirawit/jijibelugonota.pdf
    • https://uploads.strikinglycdn.com/files/0aba65b4-a775-45eb-89b3-b396791d7fd9/can_beats_studio_wireless_be_used_wired.pdf
    • https://033a7475-7ccb-45c1-8f1e-38fd320d48d0.filesusr.com/ugd/03a576_62528a53b7554ddf90432fce6f5029c9.pdf?index=true
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_d4f8007bab6b4b269cf4dcd487d755c8.pdf?index=true
    • https://s3.amazonaws.com/rumezo/54583775464.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e950.bin
9e8301a812e0963997f2c69c75bfd39e7fcc44359b8a43baf6657440e065e79d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE950 2960 bytes
font_01_sfnt_off0000f3c0.bin
22e6c05cf05b1dcef691a90a16f6bc35d2e3e898e44a4a5c46022bdc54295c61		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C0 4524 bytes
font_02_sfnt_off00010331.bin
6c99d3c1a0041feb1a5029f13e795de80a8d5261331bc1f791265e6d1df949f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10331 10932 bytes
font_03_sfnt_off000128f0.bin
680adc3f4fb4f55b2df6ce4979285ee43951559cccbfe88abd9d1275df552e92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128F0 16248 bytes
font_04_sfnt_off00013e59.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E59 4324 bytes

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