Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3cf20de7676c6ba…

MALICIOUS

PDF

69.2 KB Created: 2020-12-01 07:21:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1d096772d829689da3b741f0fe386b87 SHA-1: 1cc4a7a4b949a91c57b2a281cf37ea6bcc17c4e4 SHA-256: b3cf20de7676c6ba14b79b522a4083a1df927d26300ef3f46b7a3c13a93b2274
222 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and ML_NYX_PDF_MALICIOUS strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to 'video converter' and 'wkhtmltopdf', suggesting a lure to disguise the malicious links. The presence of numerous external PDF links also points to a link farm or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ggtraff.ru/123?utm_term=super+video+converter In PDF document text
    • https://fodibiwowi.weebly.com/uploads/1/3/4/4/134479135/47ff6ae.pdfIn PDF document text
    • https://lilawowawumoxo.weebly.com/uploads/1/3/1/4/131453384/furararunumirirofe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fc18272ff13940aa243ecad/t/5fc55727f8cdb769c6952a4d/1606768424659/19605897205.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc00a5311f6a4198480ec6e/t/5fc3d5b218e72e5fdb4d709e/1606669751529/antique_cabinet_hardware_ebay.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4d73311f6a419849eeda5/t/5fc4f445145a8629dc4c1944/1606743109487/amoxicillin_dosage_pediatric.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc306df2e537a05ef16faf6/t/5fc49626fa04221c71b1fd16/1606719016400/25335862703.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf591af3de5e49b55b9728/1606375707124/83321285279.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd0ca91af5bf52c3294906/1606225066862/world_war_1_quiz_answers.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4d3c9d793648408474b5/1606372669061/madina_book_2_sharah.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd01f62c6de34c7a398f03/1606222327660/white_oak_tree_identification.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf62a7a97599144eef462a/1606378152413/sony_vegas_pro_13_serial_number_2019.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd035d64be903ae6414352/1606222686324/tamanhos_de_papel_para_impresso.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2a2af7848ba205d23b5ba/t/5fc4d0733c6ccf69f3f644ea/1606733939755/beagle_dogs_for_sale_in_wisconsin.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0fe2417e7202640eab110/t/5fc21d487acac6192a08ffcc/1606557000450/74757272192.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81B 4692 bytes
SHA-256: 7768b3caef41d666bd40bce4423125ff76266e5c67534efd0cea8bcd02c4a6fb
font_01_sfnt_off0000d81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81F 9992 bytes
SHA-256: 5335c25ebb5393ca5728ea6381926df90653ceca190c07d2da68aad53c199dbb
font_02_sfnt_off0000fa34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA34 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378