Malicious PDF — malware analysis report

Static analysis result for SHA-256 c293d8c113526a01…

MALICIOUS

PDF

81.7 KB Created: 2021-06-04 09:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 3ec13ce9c633ef2ece3aabbc0d559a6f SHA-1: f92e1624608db536bb3676672464894cf4c1cd41 SHA-256: c293d8c113526a0168a4f300c284d6f2d406d692504c8dc4ae07dba63adccfaf
246 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The presence of a 'Payment redirection / bank-detail change lure' heuristic, combined with the document's purported topic of reverting iPad backups, suggests a phishing or business email compromise (BEC) attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to execute further malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://archism.ru/pbw?utm_term=how+to+revert+ipad+to+previous+backup PDF link annotation
    • https://tedofejufada.weebly.com/uploads/1/3/0/7/130775935/topikikijukuwikixo.pdfIn PDF document text
    • https://rigavimiba.weebly.com/uploads/1/3/0/8/130814992/sabakun.pdfIn PDF document text
    • https://marezupudi.weebly.com/uploads/1/3/0/8/130874377/8128706.pdfIn PDF document text
    • https://kowawixuru.weebly.com/uploads/1/3/4/5/134509215/tobaneba.pdfIn PDF document text
    • https://ketadamofexawun.weebly.com/uploads/1/3/5/3/135349072/zixer.pdfIn PDF document text
    • https://kogoporerosuf.weebly.com/uploads/1/3/5/3/135322240/054924da13395b5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fixiguru.pbworks.com/f/210463251.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dc16d1b-7d46-468a-ad1a-1fc7557aec66/lizawifovegewimarufomezo.pdfIn PDF document text
    • http://xosufixemuf.pbworks.com/f/1220102148.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac5204e2-ee04-4bd9-9747-7435325b0429/bisafet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90c889bd-f931-4626-9f63-715d5e609f04/kodek.pdfIn PDF document text
    • http://bovozajezo.pbworks.com/w/file/fetch/144592719/36036324105.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1069b448-2615-4b70-ade9-e0d7d4a0b084/the_leftovers_showrunner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48a33c50-1993-420c-bdb5-4e412e826f63/16750242499.pdfIn PDF document text
    • http://tujelupirobe.pbworks.com/f/kupexasozu.pdfIn PDF document text
    • http://pilujibos.pbworks.com/f/22253740375.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d83ddee-e590-4022-afd7-210d4060af0f/56582284846.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/f/sitoba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fea4d7bc-29f0-4623-bf05-ab37cdd299e9/61170987563.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/485d7412-a4a1-4582-8564-5e5dcdb62707/sutizesokobufo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c3b5a7a-4e78-49ff-a5e4-ddd5c918c9b5/how_to_use_haier_twin_tub_washing_machine.pdfIn PDF document text
    • http://gudikijuruf.pbworks.com/w/file/fetch/144479019/7526765571.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_off000100d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D3 5352 bytes
SHA-256: 60c92fd74879fbf08f7738adda1a898f29c8e52b7813fbff925447fab9e8d043
font_01_sfnt_off00011326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11326 11108 bytes
SHA-256: beed33d362e70ae478a382099ac4e075d7a24687f1a9ec370bc495ef4779636c

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