Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae691a61b87a435e…

MALICIOUS

PDF

80.6 KB Created: 2021-03-30 00:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0d1eb56dc64d5e363e1e3ca9a28834b2 SHA-1: d8498078000af2354cf8a3941103cd6c6bb71c7d SHA-256: ae691a61b87a435e83e3b2d4e48e6f6b3d0d4ce47f35bb8d2fc04d4df992c56b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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 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/123?utm_term=best+cotton+sheets+at+walmart PDF link annotation
    • https://cdn.sqhk.co/raxoxawupej/cFigge2/37432511907.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488806/normal_5ffb5be6e18c8.pdfIn PDF document text
    • https://cdn.sqhk.co/jezuleku/Dzwjijj/43999108065.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374848/normal_601928d9e607f.pdfIn PDF document text
    • http://electorat.org/218269719599lrnm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489255/normal_602244be71ce9.pdfIn PDF document text
    • https://cdn.sqhk.co/nidaruzada/gqihgdf/refewivivelefit.pdfIn PDF document text
    • https://cdn.sqhk.co/jezaziritav/A5ojbgj/sapiresi.pdfIn PDF document text
    • http://lopitimew.mygamesonline.org/affordable_care_act_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/nodujugebi/iNDst7V/keyboard_keys_change_suddenly_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/kezavilageg/idTbgcM/breakfast_sandwich_near_me_open_now.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405946/normal_601c8963e05c4.pdfIn PDF document text
    • http://lapivakop.getenjoyment.net/easy_guitar_ensemble_music.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417537/normal_602b09531aa9b.pdfIn PDF document text
    • http://wupevijijoze.mygamesonline.org/introduction_to_psychology_test_bank.pdfIn PDF document text
    • http://romeita.fun/wexalanudofufagufemiw45nk3.pdfIn PDF document text
    • http://mafejaruvoje.sportsontheweb.net/windows_system_administrator_interview_questions_and_answers_free_download.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
    • http://zakexukosogu.atwebpages.com/boaters_exam_study_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09E 4920 bytes
SHA-256: b341a1667e0f0fcb764fc7578ee5578d607e66682b440e886ab98bbea4bb6125
font_01_sfnt_off00010127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10127 11016 bytes
SHA-256: 73c2d3ddab1c822ee3e6ddf0750e6e4db4ca7eb8aa1a30cda6a7889b85703cbd
font_02_sfnt_off000125ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AC 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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