Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc39da5a54df4c2…

MALICIOUS

PDF

67.1 KB Created: 2021-01-19 16:01:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4d740a48a013e7612c1df4ba521337eb SHA-1: e9b4bf839bc29319ae0fe797f9cb69ec95e02eb5 SHA-256: 7dc39da5a54df4c26a4610ddfc19ec501c5e123e6091878422ca76fd39cb07a7
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'chemistry worksheet answers', likely to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://gettraff.ru/123?utm_term=100+greatest+discoveries+chemistry+worksheet+answers In PDF document text
    • https://cdn.sqhk.co/joxesinejag/xJgfx87/dark_elf_name_generator_dnd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408464/normal_5ff25e1fe65f1.pdfIn PDF document text
    • https://site-1177796.mozfiles.com/files/1177796/smashbox_photo_finish_primer_review.pdfIn PDF document text
    • https://site-1185944.mozfiles.com/files/1185944/ascvd_guidelines_acc.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/2561762.pdfIn PDF document text
    • http://sijuvibitita.iblogger.org/nhlbi_asthma_guidelines_epr-_3_aug_2007.pdfIn PDF document text
    • http://sawalaxal.66ghz.com/android_app_store_alternative.pdfIn PDF document text
    • https://site-1174259.mozfiles.com/files/1174259/riruxuxediro.pdfIn PDF document text
    • https://site-1235418.mozfiles.com/files/1235418/insert_multiple_rows_excel_spreadsheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368736/normal_5fb4090d2d351.pdfIn PDF document text
    • https://site-1171131.mozfiles.com/files/1171131/95633057296.pdfIn PDF document text
    • https://site-1172801.mozfiles.com/files/1172801/91662710120.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vegunag.rf.gd/bamakixa.pdfIn PDF document text
    • http://kujafugakare.epizy.com/92935322255.pdfIn PDF document text
    • http://daponub.epizy.com/27761631652.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_off0000c95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95D 5736 bytes
SHA-256: fb5d898c16c2d810a4917775170c2d574766804f88b868fdf20ea4e6e1f003e2
font_01_sfnt_off0000dcd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD9 10116 bytes
SHA-256: 31ad166542c0399932424b51e475fb0e9cdf570cc00c3251a8e3e87188bf76d1

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