Malicious PDF — malware analysis report

Static analysis result for SHA-256 b04b58716f37e8b6…

MALICIOUS

PDF

73.2 KB Created: 2021-03-08 13:47:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 42d6201e49d2c4dae4b18df01bf6a15c SHA-1: 57036a95f4a8634f8f87c95e1cc967a2c224914c SHA-256: b04b58716f37e8b6cfaf71aa0a639de94dae5b8287ded22e6c4bfe54f53a9399
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://dafemum.ru/123?utm_term=free++babylon+dictionary+english+to+farsi PDF link annotation
    • https://cdn.sqhk.co/jisokemefaz/v6dicFW/coffin_dance_meme_song_1_hour.pdfIn PDF document text
    • https://kiloxuloje.weebly.com/uploads/1/3/5/3/135398856/e82d287.pdfIn PDF document text
    • https://pevaluxuduta.weebly.com/uploads/1/3/4/5/134502983/2379710.pdfIn PDF document text
    • https://cdn.sqhk.co/keliziniw/b4Aihjd/zatipowegebetujaxa.pdfIn PDF document text
    • https://fabuxitewuf.weebly.com/uploads/1/3/4/3/134349615/kaketujope_kowovibojirin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fae64b18-3e6e-4eaf-9f26-6892cda5f00e/telugu_movie_screenplay_free_download.pdfIn PDF document text
    • https://b56e00ce-d729-42e9-814b-b9a4b194f5ba.filesusr.com/ugd/f6f93f_da14477da8c94ee3928b50b693baa7c5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/42642708337.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b2764a3-b863-488b-bcc4-a6fb705d3574/calvin_and_hobbes_books_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/free_bernice_offei_life_is_short.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/46394203682.pdfIn PDF document text
    • https://3bdad275-8828-414d-9063-9532e035d791.filesusr.com/ugd/c67d0c_79e1fd49316541608803f53f8b8dadb8.pdf?index=trueIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_2dd65e78c46c4f1e9f365edd10be9d6f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9acefb4e-a819-4bd9-acdc-ee590c1532e0/what_type_of_battery_does_a_smoke_detector_take.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/mibexuluzavuwevukakage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9e08b5d-601d-4905-bad0-db5e64a52260/what_foods_to_avoid_fodmap.pdfIn PDF document text
    • https://a5fc3680-5c08-4cda-bd6c-abaa3bdf25bc.filesusr.com/ugd/ea5d7b_9e58eecd89d74c81a6439b0182a1e43e.pdf?index=trueIn PDF document text
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_5d4ea4cf8bb448f2a268991f4f9f5765.pdf?index=trueIn PDF document text
    • https://89511c73-251b-4bee-a1a5-5f4bd4863124.filesusr.com/ugd/f24cb8_03b0c0e33c8b406da6c55ead3aff178b.pdf?index=trueIn PDF document text
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_64837147ec7449bb920fad5aa5a23a65.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tapelu/math_worksheets_for_preschoolers_addition.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF2 5480 bytes
SHA-256: 67bb3d5b5a5f3e519a439d7b4c692e6b8ce20697bf7335ebf5698929eefbb187
font_01_sfnt_off0000f297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF297 10868 bytes
SHA-256: 1458d5a643a47e38d24839771fdeedcc6653aecff0df55bf528b3b3769438a9f