Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a4b5146fb39be9…

MALICIOUS

PDF

87.1 KB Created: 2021-01-02 09:22:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 7c4c36d814bf0c5bb978fe691ff47569 SHA-1: 6a0e8e1e5fa6c451cdadb6e5929bbfefcf800a76 SHA-256: 43a4b5146fb39be9deff6b7ead03a44e7282a938e493c00b9f2dd0a27625cf74
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains a large number of external links, including a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffnew.ru/123?utm_term=do+you+capitalize+earth PDF link annotation
    • https://cdn.sqhk.co/muxigatatini/jGjevib/87625024414.pdfIn PDF document text
    • https://cdn.sqhk.co/lusajiki/KjjREgd/prison_escape_puzzle_adventure_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478950/normal_5fa8fd1ccbdd2.pdfIn PDF document text
    • https://tibanevugite.weebly.com/uploads/1/3/4/6/134655495/nebex_vopevukenub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416787/normal_5f9a42dce8cd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378618/normal_5fdc7e5024d82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390684/normal_5f951b20241ba.pdfIn PDF document text
    • https://cdn.sqhk.co/ferudati/ec7IghT/rug_cleaning_machine_rental_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425727/normal_5fd62d397c8ef.pdfIn PDF document text
    • https://cdn.sqhk.co/pigalixow/15bjeib/falling_in_reverse_lyrics_drugs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368955/normal_5f89cc1c336d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411491/normal_5fdf67591d565.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409103/normal_5fb2907adb235.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404738/normal_5fbf1064c46c8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3d6af16-f766-4b71-843c-1c50a8d2640b/38209891107.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_off00011982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11982 4996 bytes
SHA-256: 2160941cef4e455078df66b43c2536b7d39e4c0cdb73dd20f7f68269a9c5f789
font_01_sfnt_off00012a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A91 10920 bytes
SHA-256: b26792885047acb8d55f2258abf7fe1c8b6f805214bbdab9895383aa032d9cc3

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