Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8647d0b6ac73166…

MALICIOUS

PDF

67.7 KB Created: 2020-11-24 21:41:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 643ebd3064c2e97d57b65d990f8c8bc5 SHA-1: 8bdca62be0e7057ee5b909811016b67fc191cedb SHA-256: d8647d0b6ac7316634f788118f2f4610477c6546a6f290ca7d8d42e511d8f528
234 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to known malicious redirector infrastructure. The heuristic 'SE_CALLBACK_LURE' suggests a phishing or tech-support scam context, further supported by the presence of numerous external links that could lead to malicious sites or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to redirect users.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/aws?utm_term=dictionary+java+jar In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370560/normal_5f9d6492ca46c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418963/normal_5fba8f77b9704.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461516/normal_5fbbfc34afbb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465949/normal_5fb4af8ba3b55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373004/normal_5f8d532378781.pdfIn PDF document text
    • https://kupanonul.weebly.com/uploads/1/3/4/6/134682697/nujolabunef_sovevamuzuri_xuwaxesasiw_magosezogife.pdfIn PDF document text
    • https://vebifejelib.weebly.com/uploads/1/3/0/7/130775119/piwikatufal.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/nujosuwemedadi/32578666819.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/c_o_kancharapalem_movie_free_utorrent.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/toyota_new_vehicle_delivery_checklist.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/calcium_hydroxide_iodoform_paste.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/78716147789.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/alita_battle_angel_game_apk.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_off0000c431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC431 4820 bytes
SHA-256: 4b67979892f1dd362873b07b81888b89744f17a388f239d31897f6871b2eee14
font_01_sfnt_off0000d4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C2 14624 bytes
SHA-256: ff260b145ba3bd325bc289b5b8d2bf32f86cc3710927e0858819343dcb10c20c

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