Malicious PDF — malware analysis report

Static analysis result for SHA-256 833ea3c153e7de38…

MALICIOUS

PDF

77.3 KB Created: 2021-03-27 14:21:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 76e322b2eefabb4a3715ebb7bfb3ee76 SHA-1: bc3dcb6c5f66db778aa1dbd00530d4f9bef4d375 SHA-256: 833ea3c153e7de38b130adf120a95b073a9a5e1835e716e065527a147a902a94
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a high-confidence heuristic indicating it's a phishing lure, directing users to an SEO redirector. The embedded URL and the document body text, though partially garbled, suggest a deceptive offer for a 'free template'. The ClamAV detection further supports its malicious nature as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://dugedepap.ru/123?utm_term=written+warning+template+nz+free PDF link annotation
    • http://canonsburglake.org/best_books_on_mental_toughness_in_sportshgruy.pdfIn PDF document text
    • http://kulapub.22web.org/11995268242.pdfIn PDF document text
    • http://gallery-shop.site/lecturas_de_reflexion_para_secundariazu8ex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420025/normal_601b4914c8b9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421639/normal_5fee88d5cc55f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409796/normal_605b876f21f41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486965/normal_60225f976de56.pdfIn PDF document text
    • http://kibizife.iblogger.org/1176695431.pdfIn PDF document text
    • http://dusofigubil.iblogger.org/11246951603.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e81973af-ee2f-4206-91dc-d4db31c47edc/nofejotitofopegufamijala.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/rowakuwitajilorimasiko.pdfIn PDF document text
    • http://galiwasik.rf.gd/bahaya_kandungan_rokok.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/5_c_s_of_credit_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/glamour_ff14_guide.pdfIn PDF document text
    • http://bawujirilo.epizy.com/what_is_the_2nd_book_in_the_percy_jackson_series.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cc042d7-53f7-430c-8e64-5538e20bbf3a/frozen_2_script.pdfIn PDF document text
    • http://rodigosixe.rf.gd/jennifer_rothschild_bible_study_me_myself_and_lies.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/91225141164.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09d754a2-b1f3-4022-a281-32848d91958d/how_long_is_15_months_and_27_days.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA0 4876 bytes
SHA-256: d7255e59737eaba93d30fa0bc71da3506f627ee0444dca172aff4a8397ae23bc
font_01_sfnt_off0000de30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE30 10664 bytes
SHA-256: 47ec40390e0bf28e15d479fbfbf0e868e7326e19017e54a8e33db1af3387aba7
font_02_sfnt_off0001030b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030B 16140 bytes
SHA-256: 159427b32ed66bfbde86def5e6c2992bde67dfb25400c4000a37c9b59b949b61
font_03_sfnt_off00011807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11807 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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