Malicious PDF — malware analysis report

Static analysis result for SHA-256 11066c136151a7a6…

MALICIOUS

PDF

67.5 KB Created: 2020-11-23 18:43:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 390cb26051f0193d631a02a147cde87c SHA-1: 00d99e00bf55435563706420e875bd04c98236ef SHA-256: 11066c136151a7a68dccf5e9db220be794b45cf6107ad5bc8335b1a073df18ba
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and are likely part of a link farm designed to manipulate search engine results. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains keywords related to 'Pfister kitchen faucet parts', suggesting a lure to attract users searching for such items. The presence of numerous external links and a malicious redirector URL strongly indicates a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://traffking.ru/123?utm_term=pfister+kitchen+faucet+parts In PDF document text
    • https://tijabitosivu.weebly.com/uploads/1/3/4/3/134396728/teruninoribolane.pdfIn PDF document text
    • https://jumolemema.weebly.com/uploads/1/3/4/8/134853288/dosugelupawu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369771/normal_5f8fc33073537.pdfIn PDF document text
    • https://zipiluzus.weebly.com/uploads/1/3/4/2/134234939/1dea4aab55.pdfIn PDF document text
    • https://dopijixofovaje.weebly.com/uploads/1/3/4/6/134692352/ede56.pdfIn PDF document text
    • https://bigimenuxorotel.weebly.com/uploads/1/3/4/6/134655509/b416c.pdfIn PDF document text
    • https://xizogezoki.weebly.com/uploads/1/3/4/7/134717510/4274388.pdfIn PDF document text
    • https://gumebasa.weebly.com/uploads/1/3/4/5/134509515/7252448.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425921/normal_5faa55075ff1d.pdfIn PDF document text
    • https://guburumo.weebly.com/uploads/1/3/4/3/134322172/3470118.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/xubifupi/google_voice_shortcut_icon.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/36869447803.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/apink_i_m_so_sick_album.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3c60e22-05cb-449e-8ab5-54cd01aa7d8b/need_for_speed_5.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_off0000cc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5D 5136 bytes
SHA-256: 5a96bfd3390d22aed3f18eaddecaba7b998b395012f5ff887f06cbd1d200b937
font_01_sfnt_off0000ddd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD9 10432 bytes
SHA-256: 95c925ae9f762bc66949589877a67370c88c0ce81c3adf0b6f208537c6efe239

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