Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0ac8545b9b37ed8…

MALICIOUS

PDF

74.6 KB Created: 2021-03-18 08:56:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2576705d72905f31dd74bcabbe3dfd08 SHA-1: 7575e752c50f48c5fb0be001517b877c8ec6d061 SHA-256: e0ac8545b9b37ed8a30438756d0d898988aad913c5642dd549f99b10c697be6e
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, with one heuristic specifically identifying a "PDF_SEO_LINK_FARM" suggesting a large number of outbound links. The presence of a ClamAV detection for "Pdf.Phishing.Trojan" and an ML classifier flagging the PDF as malicious further supports a malicious intent. The document body, though heavily obfuscated, contains text related to "Street fighter movie free" and the authoring application, indicating a potential lure to redirect users to malicious sites.

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-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://resalured.ru/123?utm_term=street+fighter+movie+free
    • http://degakak.sportsontheweb.net/jatanazi.pdf
    • http://nigoguno.scienceontheweb.net/82586152915.pdf
    • http://sawedes.mywebcommunity.org/how_to_put_in_a_keurig_water_filter.pdf
    • http://jepenufi.getenjoyment.net/matlab_function_return_array.pdf
    • https://riragipus.weebly.com/uploads/1/3/4/3/134358734/31c4f49266a75f1.pdf
    • https://mafenipo.weebly.com/uploads/1/3/4/8/134879688/fupozur_zupodew_zamoxuvumu.pdf
    • https://vamawawu.weebly.com/uploads/1/3/0/8/130874524/joxudanulaxofi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kobivimelelo/16856845828.pdf
    • https://s3.amazonaws.com/paxuvagal/should_a_single_person_buy_a_big_house.pdf
    • http://jujobope.atwebpages.com/25191892264.pdf
    • https://s3.amazonaws.com/jevedijadiki/android_java_bufferedwriter.pdf
    • http://xolavozezimodan.onlinewebshop.net/common_american_english_words_used_in_daily_life.pdf
    • http://mikijanux.atwebpages.com/31359838812.pdf
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_63ed81c0de9f47fd8a565d1502498413.pdf?index=true
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_24d1ae90700044bb8849df14950b0366.pdf?index=true
    • https://s3.amazonaws.com/rumezo/54457429977.pdf
    • https://s3.amazonaws.com/vigevot/fundamentals_of_biochemistry_5th_edition_solutions_manual.pdf
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_50b6286623da4d23b26fd9ac3cd143de.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1caf12d6-dd84-46a0-bc58-1399c18db764/14852780606.pdf
    • https://0b21792c-a699-4cf4-8833-5910c6ad58af.filesusr.com/ugd/b0b521_96c1940ad86c449dbb85efd48682d9ff.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3fff5696-38f4-46fd-8854-4d04ccad96d5/thinkorswim_canada_cost.pdf
    • https://cb0920a4-0dfc-4587-8161-bd3bf883b043.filesusr.com/ugd/df391a_faf0d38eaf724b5680070cb181fe078f.pdf?index=true
    • 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_off0000e89c.bin
e19b2bb445f87a9d6d396fae79581ab63e62d246a6beb15a27ba1f589c49e293		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE89C 4924 bytes
font_01_sfnt_off0000f945.bin
0c6ece5c8d2bc2f68effd8eb1c0085519e20f001ccad10040b0ff42de0c4966b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF945 10572 bytes

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