Malicious PDF — malware analysis report

Static analysis result for SHA-256 0835acc38ed615bb…

MALICIOUS

PDF

78.5 KB Created: 2021-06-06 17:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 08ce8d13a9b0041ba7ea71852c53b970 SHA-1: c60f4aca0f6018899800d332e78adfa4d3335e5a SHA-256: 0835acc38ed615bbbbb80a18fa6057c42298752c9c8a33d300b677b29b0a09ee
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, containing numerous external URIs. One of the primary indicators is the URI 'https://dugedepap.ru/123?utm_term=bianca+nobilo+cnn+reporter+age', which is hosted on disposable infrastructure and likely serves as a lure for phishing or malware distribution. The PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://dugedepap.ru/123?utm_term=bianca+nobilo+cnn+reporter+age PDF link annotation
    • https://paxesejok.weebly.com/uploads/1/3/4/3/134348383/9323151.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4379984/normal_60b64460a844e.pdfIn PDF document text
    • https://felomavemupej.weebly.com/uploads/1/3/4/5/134583365/saxozodun-maxedelafafew-pogafokasebilok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416514/normal_60280f43598bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451542/normal_5fe788a37e37c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478685/normal_5fd661228af7d.pdfIn PDF document text
    • https://lapefobok.weebly.com/uploads/1/3/4/6/134663543/jipumuwut-tixojijab.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4422136/normal_60b6aef7aa869.pdfIn PDF document text
    • https://zipebamaxotunev.weebly.com/uploads/1/3/2/8/132814247/76ca89d83f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417329/normal_6010aab2ba6e1.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/7c6eb3fe-acc3-4aee-8c2d-7d17361d2a9b/what_is_the_meaning_of_advent_candle_colors.pdfIn PDF document text
    • http://visetululiv.pbworks.com/w/file/fetch/144415185/solving_compound_and_absolute_value_inequalities.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38c09ca4-827d-4ad9-bdff-adba9a60a92c/84557200370.pdfIn PDF document text
    • http://xozojonurom.pbworks.com/w/file/fetch/144609828/zatupuximisifedaletefo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95eaccd1-c3d2-4925-8742-b3404c6d161b/bugesufog.pdfIn PDF document text
    • http://xewubamefa.pbworks.com/w/file/fetch/144678426/daily_fluid_balance_chart_template_nsw_health.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d573913-5267-422b-879c-796e94b4ec56/what_should_a_biographical_sketch_include.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd1c3ef9-9a30-4ac8-92e8-f99293c3e24e/32873362680.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a260b2a-89f0-4dfe-bb59-db4ee1b5f9a4/mewobum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee4ea4f0-7785-4cbf-a123-595c42b4b08e/54379313352.pdfIn PDF document text
    • http://xafusigivu.pbworks.com/w/file/fetch/144732465/campark_t75_trail_camera_setup.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_off0000f46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46E 5112 bytes
SHA-256: b96b52ee7d6c59250f128e3e2f2ef00b837a7a20a780baa669ef2c7e8a973552
font_01_sfnt_off000105dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DD 11276 bytes
SHA-256: f668672686c6b25b2957041107d94ee1411b015285bf8c77fac745c00bd02ccf

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