Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc44d1553c2f1f15…

MALICIOUS

PDF

88.2 KB Created: 2021-05-24 09:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ace5d02381e13c2d70a1778df8cf8259 SHA-1: 24eb4685174f69d421205a7964e03c0b37a9dd15 SHA-256: dc44d1553c2f1f155f80de32c79c3a50d8c83babbeec649d0a331c75d1ae86e3
192 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, suggests a lure related to 'carding tutorial for noobs pdf'. The ML classifier and ClamAV detection further support its malicious nature, likely serving as a phishing or credential harvesting tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • 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://crophysi.ru/strik?utm_term=carding+tutorial+for+noobs+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4389571/normal_6009166d6be2e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469837/normal_5fcf48f7aac03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376625/normal_601e494b87c9d.pdfIn PDF document text
    • https://saxipapes.weebly.com/uploads/1/3/0/7/130738636/momuvukoremiwe_mukunikepe_kejozuvaxe_giwakunevibil.pdfIn PDF document text
    • https://tekadepaja.weebly.com/uploads/1/3/4/3/134341299/5418711.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453118/normal_5fe7a7a5b93c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469623/normal_606e3bf521e5a.pdfIn PDF document text
    • https://molawakipo.weebly.com/uploads/1/3/1/3/131379716/5dab470502555.pdfIn PDF document text
    • https://jewevugaxezi.weebly.com/uploads/1/3/5/9/135967143/360391.pdfIn PDF document text
    • https://nagorulanol.weebly.com/uploads/1/3/4/4/134465391/121c9ca2c307.pdfIn PDF document text
    • https://taxesewisozigif.weebly.com/uploads/1/3/5/3/135394589/lidisope-zosivukopa-dubofibotamu-vadit.pdfIn PDF document text
    • https://fomodaduvi.weebly.com/uploads/1/3/4/7/134700625/5f4745ed00d35a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464330/normal_6068f4863e8d0.pdfIn PDF document text
    • https://xagatozemeladab.weebly.com/uploads/1/3/1/4/131406701/823a8252f1bbe44.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454668/normal_5fc81443ad0ed.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/5bc098f7-1225-49ff-a182-e61c13d13130/what_is_the_principle_of_finality.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ece3103-34c1-43ef-9183-df05395160e0/modal_verbs_worksheets_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/60871770956.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/pdf_to_word_converter_software_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83815fc9-06a9-42e6-a9c3-7bedd12b5065/kung_fu_panda_2_watch_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/853718818.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5966240-4978-470a-953e-2b01133505e9/73303178866.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/cushing_syndrome_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73daf22a-79c1-4c79-98e0-7a5da938a623/navoranorosob.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_off00011b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7A 5256 bytes
SHA-256: b369e18d2aa1fb871849f0b2dbf5efee37d9d57fb756cdd0df7ae1586826a65b
font_01_sfnt_off00012d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5F 11384 bytes
SHA-256: b729565e1e5a09256e92317394b9c1c064a2733c51c2ea0861be1331bd6df122