Malicious PDF — malware analysis report

Static analysis result for SHA-256 e249bcc16fc2ff0f…

MALICIOUS

PDF

74.4 KB Created: 2021-06-01 14:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b1aec864888edce5f893a1cf8b8cd4f6 SHA-1: 6693c7df1c2f5c8fc620d0845fd1f1fc8b14a8d8 SHA-256: e249bcc16fc2ff0f12d1a9295d66f7fe2b954426b0f84cc912f77f4f31ec4096
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'fokemale.ru'. The document body, though heavily obfuscated, suggests a lure related to a 'diet sheet', which is a common tactic for phishing or malware delivery. The presence of external URIs and link farm characteristics further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/123?utm_term=spur+thighed+tortoise+diet+sheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490523/normal_60567c68a70d0.pdfIn PDF document text
    • https://vogemafebin.weebly.com/uploads/1/3/4/2/134235603/tesutabu.pdfIn PDF document text
    • https://divuvefa.weebly.com/uploads/1/3/4/7/134759037/xuniwarimimarumul.pdfIn PDF document text
    • https://kitogabizog.weebly.com/uploads/1/3/6/0/136053612/bidodetobute.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459939/normal_6005233b157a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496005/normal_60639451f07bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476288/normal_603badfa8f47d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418985/normal_5ff92b5139ab8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368745/normal_5fdfb1bbbb7c9.pdfIn PDF document text
    • https://bunogijadijis.weebly.com/uploads/1/3/4/8/134896562/6641476.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365551/normal_5fe3df6899e2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402262/normal_6013e2bd9d46d.pdfIn PDF document text
    • https://kixujededewi.weebly.com/uploads/1/3/0/8/130814479/2571979.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kolelulu.pbworks.com/f/605134733.pdfIn PDF document text
    • http://bojirakaj.pbworks.com/f/batla_house_full_movie_download_filmywap.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/f/ikea_luroy_full_bed_frame_instructions.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/f/50493482842.pdfIn PDF document text
    • http://garigor.pbworks.com/w/file/fetch/144425202/gbc_4250_laminator_parts.pdfIn PDF document text
    • http://gitefov.pbworks.com/f/possessive_adjective_worksheet_grade_2.pdfIn PDF document text
    • http://mosijiv.pbworks.com/f/kingroot_apk_download_latest_version_2020.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_off0000e795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE795 5084 bytes
SHA-256: 45683c44cd5408335dd87f0e672abd9b8571c90e84b169da50e8ed4603e7de7f
font_01_sfnt_off0000f8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DC 10472 bytes
SHA-256: a108cbd4b3b80f3d35e70389c705aeaf8d418cba76431b7faaec37ceac685a51

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