Malicious PDF — malware analysis report

Static analysis result for SHA-256 36664b1f83e1be39…

MALICIOUS

PDF

68.5 KB Created: 2021-01-16 14:19:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 189f8a90a66f2c24362096cb2cb7a80a SHA-1: da11814edca32774d465a619e98b67bcbd38c9b1 SHA-256: 36664b1f83e1be392ab1294d79902a9b93c4ca329625c65c4aec6cbbb043d0f4
192 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, routes users through malicious redirector infrastructure and presents a deceptive download button. 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ggtraff.ru/aws?utm_term=safari+webarchive+for+windows In PDF document text
    • https://static.s123-cdn-static.com/uploads/4465938/normal_5fcceaa38baf9.pdfIn PDF document text
    • https://site-1178040.mozfiles.com/files/1178040/mystery_mansion_match_3_question.pdfIn PDF document text
    • https://cdn.sqhk.co/mivesavif/RgfjfMF/epic_seven_anime_characters.pdfIn PDF document text
    • https://site-1176018.mozfiles.com/files/1176018/monizabumojuna.pdfIn PDF document text
    • https://site-1235432.mozfiles.com/files/1235432/bijafofigujole.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408871/normal_5fd3bbbc3d3c5.pdfIn PDF document text
    • https://site-1172723.mozfiles.com/files/1172723/51793236836.pdfIn PDF document text
    • https://cdn.sqhk.co/pozigafo/iAsifx5/85958611292.pdfIn PDF document text
    • https://site-1251451.mozfiles.com/files/1251451/tnea_allotment_order_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369509/normal_5f9c9d07bf268.pdfIn PDF document text
    • https://wuzesitawe.weebly.com/uploads/1/3/4/7/134733123/9473eddd99a2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/kaxajorefexilimogadopize.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/dijujerosivegez.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/lp_bronkopneumonia_anak.pdfIn PDF document text
    • https://s3.amazonaws.com/moduluzuxikari/bumblebee_transformer_coloring_pages_to_print.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/cambridge_english_complete_pet_workbook_answers.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_off0000cd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD66 5472 bytes
SHA-256: dbed8119a9aeb422f826a9800f782c016b1a02b194142e3c6d1eb03ccffd8cb5
font_01_sfnt_off0000e01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01A 10744 bytes
SHA-256: 3a35a867f235818711512e7bfe4a7edfac43672da59bd3cc167e7ce7d94d7aed

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