Malicious PDF — malware analysis report

Static analysis result for SHA-256 68d98d978b3038c4…

MALICIOUS

PDF

93.8 KB Created: 2020-11-28 01:20:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 9dd283a6ff566f6991a4c1e93838e114 SHA-1: 1d8ab55ee8aad32251d7e156781a023ab92be1af SHA-256: 68d98d978b3038c4eafe5c6092baada07e9ac500a87afd87a0129f456db40029
222 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirection and a link farm, including a critical finding for a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of embedded URLs and the overall structure suggest an attempt to redirect the user to a malicious site, likely for phishing or malware delivery.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=polar+and+nonpolar+molecules+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369764/normal_5f961c38e1bf9.pdfIn PDF document text
    • https://luwinititik.weebly.com/uploads/1/3/4/5/134587042/5576639.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446633/normal_5fb3558968fd5.pdfIn PDF document text
    • https://ziresaro.weebly.com/uploads/1/3/4/5/134509830/ruzomud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375694/normal_5fa6e071b98fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369495/normal_5f9673cd88375.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474980/normal_5fa8aa979fcaa.pdfIn PDF document text
    • https://miremewokar.weebly.com/uploads/1/3/0/7/130738658/451e1ba479d3762.pdfIn PDF document text
    • https://zadumujiz.weebly.com/uploads/1/3/4/6/134626950/muvuzurixoxalun.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/c3e8e078-82f6-487f-8abc-780cc86604e8/damomazugebowok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62524edb-07e8-4f9a-bbf1-683c7b06bbee/84069387405.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6599635-bef9-45f9-95c9-3328dd0c79a1/redaccion_juridica_pucp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/639b776a-4050-40d4-aba2-e5217fb467f1/miponopexesut.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/ulcerative_colitis_guidelines_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/pedagogy_of_biological_science_ncert.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74fd8638-bec5-4b7c-abc2-3280672664bc/gufubixukafaduja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b01d376-eed0-442c-8a8d-2997b7bc3f05/how_to_cancel_avast_cleanup_trial.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_off00013077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13077 5468 bytes
SHA-256: 8ddbd4ff886a697f195f2591efb497b895b6d9d1820a0bec23c3b9b928ae33ce
font_01_sfnt_off000142f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F7 11432 bytes
SHA-256: d16b58c8e4586afc8dc95906d604b388365fc60dab40d91f555e547930d171a6

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