Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9c83be483c907e2…

MALICIOUS

PDF

71.0 KB Created: 2020-11-21 08:45:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d97d253ee37f61d1889cb8fe3b32777b SHA-1: bc4323a2f1d9a703370dc4bf8f10f9ec4659dc20 SHA-256: f9c83be483c907e2a19d4daf6e9e3cc61d0b47302ee07ed2829bb8e1733dabf1
214 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://traffmen.ru/123?utm_term=clash+of+clans+raiding+strategy+town+hall+9 In PDF document text
    • https://nagorulanol.weebly.com/uploads/1/3/4/4/134465391/lekeguz.pdfIn PDF document text
    • https://dujodorenenap.weebly.com/uploads/1/3/4/4/134488447/degosejukikuk.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://uploads.strikinglycdn.com/files/6e5e4592-b440-47d3-a771-f32f31b94ca7/18978156517.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/896853a9-66ac-4cd9-87b0-eedf7a82e8ec/98693370825.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/toner_tn330_or_tn360_brother.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6a0d7be-023b-4b60-9759-eb0a5ffa7836/pasugo.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/agenda_2019_gratis_argentina.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/amazfit_verge_app_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3329e86-87f5-43d4-9970-a23b483245cf/34472968640.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0ef5f34-92eb-4877-9590-3000e4faa560/the_last_lecture_guided_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/tojifozibugu.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/16806982116.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/un40h5003_samsung_tv_manual.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_off0000c51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC51E 5444 bytes
SHA-256: df7cc16dbd717bc58b9ba0cf50e7e1b54fec37dee23ad7ae6e91dd4b868a9729
font_01_sfnt_off0000d7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AC 12840 bytes
SHA-256: 757ec3022f2154ae93ac9687b42f43d1421c5efbbc16670f3bdbecc8cd377def
font_02_sfnt_off000100a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A6 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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