Malicious PDF — malware analysis report

Static analysis result for SHA-256 52c217160ec9605e…

MALICIOUS

PDF

69.9 KB Created: 2021-03-13 17:08:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 13d37a21b67d68a574f913e893211dd1 SHA-1: 5f062447f61b9943c6c582f3a30a044a5ea75932 SHA-256: 52c217160ec9605e88b5492eb55b3b9b29a43c52c62743cb6553e2df79e2cfd6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/award?keyword=npc+character+sheet+5e+pdf PDF link annotation
    • http://vorecan.space/viral_news_urdu_breaking_newslykwt.pdfIn PDF document text
    • http://gajitad.22web.org/8396887859.pdfIn PDF document text
    • http://medyahanem.com/anti_stress_coloring_book_free5991k.pdfIn PDF document text
    • http://skout.tech/manual_assembly_line_adalah791ts.pdfIn PDF document text
    • http://josusama.iblogger.org/taluvajalamibopoxite.pdfIn PDF document text
    • http://gratoraama.website/6173504546pn9yc.pdfIn PDF document text
    • http://naturalm.space/wheel_of_fortune_game_show_quoteszkkpf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_dbb5e475ff7543419d49c72e5062e7d8.pdf?index=trueIn PDF document text
    • https://2cfcb734-ec62-4cd9-b61c-03d4762ad765.filesusr.com/ugd/a891c0_0f6ab95025ed4b0b91f84c44d4cba24f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/36ba5899-d2cc-459c-be9f-e475836bce07/rinuvizodevutodaxad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/341487d9-3778-498b-9f97-c8a0612386fb/graphic_design_jobs_and_requirements.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47b8c123-d4a4-46b8-b863-9c3a777cf8b8/13763091891.pdfIn PDF document text
    • https://8772a198-af03-49ef-8724-5feb7546cb8a.filesusr.com/ugd/436f04_3354da39efa346c09ab25d58476ad055.pdf?index=trueIn PDF document text
    • http://fifozeripomok.rf.gd/planet_fitness_set_up_fee.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b769ce83-9541-4541-9a48-40953d8301b8/samsung_rs265tdrs_error_code_22e.pdfIn PDF document text
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_230ca1c0c50c41d9aca2d2ed1742b865.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/865c30ba-c601-46be-91dc-22939e0c26a3/80057199624.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a96f009-cb91-44c1-8011-c1a73b4b869c/everyday_use_short_story_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb8d7760-33fc-41b6-b149-48f258debac1/lufaloborezegar.pdfIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_ca6ba483a45b47f187965726343fd3c9.pdf?index=trueIn 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_off0000d542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD542 5304 bytes
SHA-256: 3cb2ee264e024c71336db7cdc108c7b8864c055631191d6740ebb31e9273f292
font_01_sfnt_off0000e751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE751 10344 bytes
SHA-256: 8848c4b59c8ffe8a2864efe1f98d3c1eacfd37b54fccf285bb43484f388b496c

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