Malicious PDF — malware analysis report

Static analysis result for SHA-256 254e1e4db19b7f8c…

MALICIOUS

PDF

80.3 KB Created: 2021-06-07 15:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 62cb0f96a4cc9119220196b99f8c51cb SHA-1: 3d9acc2942f153d11a3477a360d3a6af43a7aa4b SHA-256: 254e1e4db19b7f8cae3d2bad944e781d176686e3f0a9277fc2e182489e0f0168
244 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are identified as malicious redirectors or hosted on disposable domains. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' strongly indicate a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the embedded URLs and the nature of the heuristics suggest the document's primary purpose is to redirect users to malicious infrastructure.

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
  • 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.
  • 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.
  • 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://dafemum.ru/123?utm_term=excellent+camera+app In PDF document text
    • https://vefibaxo.weebly.com/uploads/1/3/1/3/131379874/nudopupa-gobezaxezuket-vomapotoxudifi-zemaxewetuvu.pdfIn PDF document text
    • https://gumelajijepepa.weebly.com/uploads/1/3/4/6/134639918/jiwatiba_bifeg_fuvidudower.pdfIn PDF document text
    • https://kanamatadu.weebly.com/uploads/1/3/4/3/134366206/voruwileleku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465702/normal_5fe145fc1e9ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449630/normal_6056ae2a65e62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421201/normal_6022280b53642.pdfIn PDF document text
    • https://xukopalobupekon.weebly.com/uploads/1/3/4/7/134730613/nasag_somegiw_xibanituzedat_nemadu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492253/normal_602c09ed8ba82.pdfIn PDF document text
    • https://majejuwusi.weebly.com/uploads/1/3/2/3/132303270/pededekokeke_finubirufufaj_dukodoxub_duwisulota.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/fbc5777c-9cc6-449c-b3d4-c2f50c9523c1/60110103153.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03525960-b8c7-4301-8020-0f1f336c6f88/how_to_handle_adhd_child_in_class.pdfIn PDF document text
    • http://kepojijudiva.pbworks.com/w/file/fetch/144564675/bigekuwikekodenameloso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dff62d8a-087f-4644-ba92-e5755fe06fa1/mobubavijokunig.pdfIn PDF document text
    • http://ruwezebom.pbworks.com/w/file/fetch/144424962/6778898009.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6df0daf9-3dac-4e47-8f6b-b6882605b911/2280109595.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59d81816-1798-4b07-b9c7-c476b8463eb2/python_download_csv_from_url_pandas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5090769e-9727-4823-8dfe-4e8d994190aa/electrical_engineering_pocket_handbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07c66852-b4df-4f70-b02c-fa8bbc5c1e6c/what_is_the_best_dvd_recorder.pdfIn PDF document text
    • http://jebusolole.pbworks.com/w/file/fetch/144490215/fojumexo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b87fafe-6f36-46bc-a51a-394c85384f43/mitagajemewusiperalo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35267d92-7298-4aef-a8d5-09d0e040e7f4/how_to_find_slope_and_y_intercept_on_a_graph.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/973d35f2-e676-43b0-ba42-c806b1e9927b/4298028648.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_off0000fdfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFC 4924 bytes
SHA-256: ff227eb7ce46e3e35e5f89d53252b954755496da669e1e8d984c4e7ccbfa66e3
font_01_sfnt_off00010eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAF 10940 bytes
SHA-256: 36dde0407f89f6f63979c2443d461c8711e0b4a38c4cac30d5174ac65d87b323