Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d5356556d03cd06…

MALICIOUS

PDF

75.0 KB Created: 2021-03-03 13:11:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6b5c827818081929317e847285044242 SHA-1: 634ec65a4047c64e3a0d1b5daedd41a4ed2a2800 SHA-256: 2d5356556d03cd06bf7e1d9087cbe545d9172033a27e00a432864e749df3ba3c
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains keywords related to a printer cartridge, suggesting a lure. The presence of many external links and the ML classifier's high confidence score indicate a phishing or malware distribution attempt.

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://crophysi.ru/wb?keyword=dell%20b1160%20printer%20cartridge In PDF document text
    • https://cdn-cms.f-static.net/uploads/4465003/normal_60228bafa3b6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464878/normal_602ea490e0f24.pdfIn PDF document text
    • http://zexawil.22web.org/6569990723.pdfIn PDF document text
    • http://xamibava.22web.org/78497876813.pdfIn PDF document text
    • https://ditufanavuj.weebly.com/uploads/1/3/0/7/130738569/ridikadine_bilugagiliwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365634/normal_6020343dcb6a1.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://s3.amazonaws.com/fajetufekejo/76658548963.pdfIn PDF document text
    • http://zilomit.epizy.com/jeminofuwelibozob.pdfIn PDF document text
    • http://zepibugab.rf.gd/17281866428.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/99_names_of_allah_download_mp3.pdfIn PDF document text
    • http://tafogekodunegi.epizy.com/68599439722.pdfIn PDF document text
    • https://s3.amazonaws.com/tugafebip/chsl_2019_syllabus.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/bdfoundry_ninja_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/samsung_button_game.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/biblia_takatifu_apk_for_android.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_off0000dc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2A 5228 bytes
SHA-256: 91354841484bf16bb97b88604f6ecd5623855569cd2ddc6d4167d5107bd7173c
font_01_sfnt_off0000edf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF2 10172 bytes
SHA-256: 600057219d2388378df9ae3212546c061c4d48a5cecb2aa6756eebe52c3e2b8e
font_02_sfnt_off000110db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DB 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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