Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea728364ac360beb…

MALICIOUS

PDF

71.8 KB Created: 2021-02-21 04:59:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6bbf17392e28d9168aea7adc4b939e6b SHA-1: eb32491613767946faef2cbaae4ae94b7c6d2faa SHA-256: ea728364ac360beb587f59145cb233f26fcd110459701cf9cc16c06615234f0c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a link farm on disposable hosting and a high ML score. The embedded URLs, such as 'https://leonvi.ru/wix?keyword=ap+biology+chapter+7+reading+guide+answers', suggest a phishing or content-luring attempt. The presence of external URIs and a link farm indicates an attempt to redirect the user to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/wix?keyword=ap+biology+chapter+7+reading+guide+answers PDF link annotation
    • http://difavusimope.iblogger.org/sip_abacus_worksheets_for_level_4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492897/normal_60040b512dd96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469370/normal_602283de9e49e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402247/normal_5fda4dfe158f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480580/normal_5fe4eb3ed0ff8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391893/normal_602786dc473a7.pdfIn PDF document text
    • http://funseeds.site/is_computing_science_the_same_as_computer_science77hv4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428331/normal_601ba74f2c6a3.pdfIn PDF document text
    • http://gratoraama.website/reddit_making_money_on_instagram_2018w8rl5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426271/normal_600078c718836.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427809/normal_6028a0482bd39.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://merekum.rf.gd/clinical_social_work_exam_study_guide.pdfIn PDF document text
    • http://vekoxoke.epizy.com/dos_usb_boot_stick.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/1640627933.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_off0000db0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0A 5736 bytes
SHA-256: 8ce20192ef80dd9e5b23a4e502faae2271b08eb4cbe1412f280568995c1e616b
font_01_sfnt_off0000ee9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9E 10240 bytes
SHA-256: 795b16ee147c7325fa500a576ed269c9fbc25bda739de3c01b077ca982646b42

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