Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d4da7996effa08…

MALICIOUS

PDF

82.4 KB Created: 2021-01-13 08:48:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f8d1bff746cb01bb35c9bc35bd124dfe SHA-1: 95624a34e80c26668f9e71c059663f95305226db SHA-256: c7d4da7996effa0829a91e45cee8b5c3550a1f3209a4ac889606e31e402ceaa5
222 Risk Score
Tags
free-cdn-ebook-manual-lure

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 heuristic findings indicate a link farm and a critical ML classification for maliciousness. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is designed to lure users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cctraff.ru/123?utm_term=blue+howlite+bracelet In PDF document text
    • https://cdn.sqhk.co/zibojaje/sigibgi/pockets_billiards_san_antonio_tx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406514/normal_5fc6a6630f812.pdfIn PDF document text
    • https://site-1195189.mozfiles.com/files/1195189/81929578359.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415739/normal_5feb86ab3afdc.pdfIn PDF document text
    • https://sivivaleretuvu.weebly.com/uploads/1/3/4/3/134324596/rinajogixotaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366365/normal_5fbaa88a6305e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465257/normal_5fce14be00435.pdfIn PDF document text
    • https://site-1167931.mozfiles.com/files/1167931/russian_cars_simulator.pdfIn PDF document text
    • https://cdn.sqhk.co/jagapifa/iCgd2gd/star_wars_x_wing_pilot_jacket.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
    • https://s3.amazonaws.com/kovilowab/candide_telecharger.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/young_ma_chiraq_freestyle.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/39317949827.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/24739913992.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/android_programming_darshan.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_off0000fb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB43 4764 bytes
SHA-256: feeb853781539e5cb593012a78b4ca18ca5d61afbd5c4038e5c112983e828980
font_01_sfnt_off00010b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9B 10244 bytes
SHA-256: 4647d9157e115b6ecfd403e3891e9c216f9d7513605ed4af3d89f22947d22a62
font_02_sfnt_off00012e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7F 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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