Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c934f2934047ae8…

MALICIOUS

PDF

72.5 KB Created: 2021-02-18 10:32:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 40758e94714597158f04d6811b313d8d SHA-1: 9b328745c7a0744c0cb36605a786546e08a4eac5 SHA-256: 6c934f2934047ae8b1b83db49943a4cc175a47bcc4d437b81fdcb75e1228eb88
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://jacksth.ru/strik?utm_term=percy+jackson+book+3+read PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414352/normal_601d8856b475d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482206/normal_5ffbaed864dce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385030/normal_5fda5dfcca3bb.pdfIn PDF document text
    • http://kigurumi.org/ffxiii_weapons_guide_best_weaponrh1o2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380395/normal_60114af32ca69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487631/normal_602abe684905d.pdfIn PDF document text
    • http://organicsss.space/tabla_de_trigonometria_senop1m8p.pdfIn PDF document text
    • http://keto-menu.online/bakexawu5vq7q.pdfIn PDF document text
    • http://dimax-matrasy.ru/partnership_math_in_hindiutxme.pdfIn PDF document text
    • http://wiinorama.website/1574574204s7r68.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410016/normal_6005180c21a80.pdfIn PDF document text
    • http://baugroup.info/624802543954msa2.pdfIn PDF document text
    • https://cdn.sqhk.co/bepemuno/pDijiek/scientific_method_maze_worksheet_answer_key.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428329/normal_5ffb8bda8bc6a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465389/normal_6003ed18c15a7.pdfIn PDF document text
    • http://smilex.club/xapuxomilutokesafizogadr8pxo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369163/normal_5fede4efa18e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447280/normal_5fe9512a1f368.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464877/normal_5fe64a8e45295.pdfIn PDF document text
    • http://domavera.ru/amazon_music_download_purchased_songsz1jum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000df78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF78 5448 bytes
SHA-256: fe102ca002a59c42f22ceca623c29704c9578f97360ad77c5f04d5d5a5bdc789
font_01_sfnt_off0000f214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF214 10252 bytes
SHA-256: b9a3bd4bcb603c32f77a04c6c56a3a689ab41c2d5cd00a7a6c6cdf4f68977f15

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