Malicious PDF — malware analysis report

Static analysis result for SHA-256 70ca70236d8bef77…

MALICIOUS

PDF

75.1 KB Created: 2020-12-04 12:38:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8b1e79934be492ca0e377a8a3ee02575 SHA-1: 1dc160e41255760724b6c307241e3e9000170cee SHA-256: 70ca70236d8bef771b22216e37254c77bc1b16959bdc4fb737db659ae1caa3ea
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector and a link farm. The document body, though heavily obfuscated, appears to contain keywords related to 'diabetes screening' and 'guidelines', suggesting a lure. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/aws?utm_term=diabetes+screening+ada+guidelines In PDF document text
    • https://cdn-cms.f-static.net/uploads/4504568/normal_5fbda39f8f911.pdfIn PDF document text
    • https://sifufunozomelu.weebly.com/uploads/1/3/4/7/134764248/julodegulibasal-lininim.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/5fbffe9d5687f52b6b7c161f/t/5fc46552fa04221c71ac6df9/1606706515299/manaless_dredge_primer.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/formal_resignation_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/35214863999.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc12c5140f1034a5caa9112/t/5fc5ae66e18c5c478ebf78c0/1606790761391/msmc_library_staff.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc65d1d1c8c741314573aa3/t/5fc863bfb0f45b2a3d244d89/1606968255621/plunder_pirates_western_seas_map.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/60829511094.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6b7cb579eee3ae068beec/t/5fc7f6f02c0e4c30f4c3469a/1606940400221/classlink_fulton_app.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/54876608221.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/atualizar_android_lg_g4.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_off0000dcad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAD 5020 bytes
SHA-256: 8ebb320c58b33048b537e5c0d7997e4dc192ede2d2f42d60cdcdcec041ce7680
font_01_sfnt_off0000edbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBB 10700 bytes
SHA-256: 51fb0069f5ae68ba62a14dc5903b831b68c78a30a81f63bb1c59bdfd8d7f660f
font_02_sfnt_off000111cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CB 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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