Malicious PDF — malware analysis report

Static analysis result for SHA-256 e30ce0b9be1339a4…

MALICIOUS

PDF

75.0 KB Created: 2020-12-17 02:02:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 333474b90d90af9f37ab3a74cefe7baa SHA-1: d190cd6fc05d6f9201fa2c190067c7e908dc3fc1 SHA-256: e30ce0b9be1339a4a41f4fca64f870281cac80eb35dac93153ad95f52ac16a84
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one prominent URL pointing to a suspicious domain. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/aws?utm_term=herpetiform+oral+aphthous+ulcers
    • https://cdn-cms.f-static.net/uploads/4380237/normal_5f96f180b5786.pdf
    • https://xazapadikud.weebly.com/uploads/1/3/1/8/131871762/bd4e3b54762c66b.pdf
    • https://baxelawinojiw.weebly.com/uploads/1/3/4/3/134333718/xisefofizuju.pdf
    • https://zamojimap.weebly.com/uploads/1/3/4/1/134131359/6c87f093df54b2c.pdf
    • https://sowozulame.weebly.com/uploads/1/3/4/7/134733070/ripovoxoxo-xuropisazusura.pdf
    • https://zuduloto.weebly.com/uploads/1/3/4/6/134623707/6345373.pdf
    • https://cdn-cms.f-static.net/uploads/4452587/normal_5fa8a965a3926.pdf
    • https://cdn-cms.f-static.net/uploads/4383572/normal_5fd7c21646666.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static1.squarespace.com/static/5fc66db9a8793968642e0201/t/5fc7ae02c7c45a5eafaeeed4/1606921733024/ps4_pro_racing_games_2020.pdf
    • https://static1.squarespace.com/static/5fc1ceb7bdb33045eec8b031/t/5fcd5a087ae85b53b2a2c62f/1607293449228/55104669049.pdf
    • https://static1.squarespace.com/static/5fc115d62bbd7406580792b0/t/5fc1652f7acac6192af531f9/1606509878650/personal_math_trainer_lesson_1.1_answers.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd74.bin
14b60f2aeea82211440b5259769c87d7569bafdd5ef151dc375d57b8a9eb5520
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD74 4992 bytes
font_01_sfnt_off0000ee67.bin
aed43452b264e5cc21cab248951e239c27fcc52c8dda0860a1a51aaa68d6e16f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE67 10288 bytes
font_02_sfnt_off00011157.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11157 4324 bytes