Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8cf80b346dd11ec…

MALICIOUS

PDF

76.6 KB Created: 2020-11-23 12:20:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 617935b0125ac2ea47f0795be5d2cd91 SHA-1: 2f313f3f47de1fce03791014c4fee314565efb1e SHA-256: c8cf80b346dd11ec8c06a099dbb41c2ce22633580a166d379a168c95c59db6b7
222 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. 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 0.9996

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/strik?utm_term=free+ringback+tones+for+android+phon In PDF document text
    • https://fulafokowezoje.weebly.com/uploads/1/3/4/3/134384829/05a6840e64a4a1.pdfIn PDF document text
    • https://velineninebag.weebly.com/uploads/1/3/4/6/134608195/6979321.pdfIn PDF document text
    • https://lalemudisezevo.weebly.com/uploads/1/3/4/3/134359520/7166845.pdfIn PDF document text
    • https://zurenigexozaxil.weebly.com/uploads/1/3/4/6/134606750/7807893.pdfIn PDF document text
    • https://zoveponezewuda.weebly.com/uploads/1/3/0/7/130738822/6594323.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/billennium_ballard.pdfIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/blake_pierce_free_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8740a943-a74f-4bb2-8a78-a5755dc4eb16/auditing_and_assurance_services_16th.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1de6295-2bff-4776-a063-cdf6abed6ee1/hacked_talking_tom_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/zakikugafuxukajarim.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/zedawalixozogaladupivux.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/43080489442.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24dfd2d8-9583-452e-b5f6-95bd9f1e3ce5/wepadakef.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/manual_merck_de_veterinaria_6ta_edicion.pdfIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/the_design_of_everyday_things_download.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/79402189323.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFB 5544 bytes
SHA-256: c0797e2181553dcc2e9cddd7292068cc670c585ea64d8f41e904cad9ab1ff833
font_01_sfnt_off0000ddcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCD 2112 bytes
SHA-256: afb52987f298f07af809284f40e361a47f42691a8b8224f89abc1e600d776001
font_02_sfnt_off0000e79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79F 10980 bytes
SHA-256: 8414da3383e4b9f43a6602bac04e7331c205a121efa0c95b4a7f9552334eca02
font_03_sfnt_off00010c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9E 16976 bytes
SHA-256: 6ac605f45ba0033265ea715c6807175e31cc1cc85be53c23fe5f6d106e327bf6

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