Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f267ca68479887…

MALICIOUS

PDF

74.8 KB Created: 2021-03-24 05:47:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: fb81480e2cbb7085b5193e902f5945ea SHA-1: 06ee07d319d28c601e9bf8ccb925a5176eaa94f1 SHA-256: 03f267ca68479887ff1525319a97b9e019f55fdb094467c5fa8d8ce48a463b0d
186 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to disposable domains, suggesting a link farm used for phishing or malware distribution. The embedded URL 'https://fokemale.ru/wix?keyword=australian+slang+worksheet' is presented as a worksheet, a common lure for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://fokemale.ru/wix?keyword=australian+slang+worksheet PDF link annotation
    • http://milanomoda-italy.site/three_skeleton_key_summarypup33.pdfIn PDF document text
    • https://manobafezelibo.weebly.com/uploads/1/3/1/6/131636879/2204826.pdfIn PDF document text
    • http://mklhhhh.space/3989482887461et2.pdfIn PDF document text
    • http://cyberghost.store/cartes_du_ciel_androidde8ti.pdfIn PDF document text
    • https://pavemizex.weebly.com/uploads/1/3/1/6/131606984/wibasatoma_wogobomif_tuletowuxigad_bivet.pdfIn PDF document text
    • http://organic-ita.space/levels_of_biological_organization_worksheet_dociqdrx.pdfIn PDF document text
    • http://affilateapp.online/pinajipowiranozikonibj5gd0.pdfIn PDF document text
    • http://servempieza.site/41602403227u2oja.pdfIn PDF document text
    • http://daating19.site/kegidimifosu9ewnf.pdfIn PDF document text
    • https://gematisi.weebly.com/uploads/1/3/4/5/134599806/3307071.pdfIn PDF document text
    • http://reactivaperu-viabcpi.com/229427721099crof.pdfIn PDF document text
    • http://fapseo.ru/46806307554xjtze.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/e43a1a35-3ab4-4e30-98fc-7c3e96c6ec69/finite_mathematics_and_applied_calculus_7th_edition_free.pdfIn PDF document text
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_74c856c21f754a7c931fd5a1164d4956.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mukutud/the_ecology_of_freedom_murray_bookchin.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/3610255448.pdfIn PDF document text
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_20bd428fcf76449b9198cf0dae8d0b30.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/widetunipet/retail_marketing_syllabus.pdfIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_93b8fcea3f49466b90de537fda7055be.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc16e01a-e0e7-46a9-8bb8-0b5f1c23dfca/netgear_nighthawk_ac1200_review.pdfIn PDF document text
    • https://a8a2d6b8-6248-42a0-90a4-e25e421c2e59.filesusr.com/ugd/f63f29_12e2a9d5acb64f47b762ccb440774e66.pdf?index=trueIn 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_off0000e6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E3 5092 bytes
SHA-256: 9ce2bd3415a44ef1fbe5144f8881308020d5416517b3e1d0450625ed93491887
font_01_sfnt_off0000f841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF841 11028 bytes
SHA-256: 9926a635239cb09a31b91c70368253d41addf1f00ce1bd79b5b3a0039aab0716