Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8e47ea4a612e10…

MALICIOUS

PDF

74.7 KB Created: 2021-01-31 19:48:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 30517c7db440f2638180eed0f053f43f SHA-1: 03901131130ea855dda7f4d54b8b844c59b69b30 SHA-256: 5f8e47ea4a612e1055524832cf538aa4b198b1eaf54ba958bb826ffb8724a160
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/aws?utm_term=avast+antivirus+free++for+macbook+pro PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420438/normal_600abac257dac.pdfIn PDF document text
    • http://kittyplay.online/bubagujajesajegitumoriro6z4su.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447662/normal_6013f4d5c9584.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466146/normal_600e641a91c17.pdfIn PDF document text
    • http://rte-ita.fun/93908719578vcdf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495846/normal_600f45f814cd4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455642/normal_5fc59acb2090c.pdfIn PDF document text
    • http://slampochka.ru/72336772762yzuds.pdfIn PDF document text
    • http://bumexusuladix.iblogger.org/tiduvepesufofenegu.pdfIn PDF document text
    • http://stassikorskyi.com/430851561474adlp.pdfIn PDF document text
    • http://leree6.club/gifilobetitefamepuwogk9fgc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365551/normal_5ff24abbe32dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456663/normal_5fde52705792c.pdfIn PDF document text
    • http://vezerfa.xyz/194941052262f932.pdfIn PDF document text
    • http://ru-dev.xyz/vocales_y_consonanteslvxmh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vusevupitiwo.rf.gd/attagasam_songs_free_tamiltunes.pdfIn PDF document text
    • http://xuvunemomot.epizy.com/70240629475.pdfIn PDF document text
    • http://notewewagegev.rf.gd/epidural_in_labour_guidelines.pdfIn PDF document text
    • http://reluwiz.epizy.com/avast_free_setup_file.pdfIn PDF document text
    • http://lijazujarakowom.epizy.com/border_movie_ringtone_song.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_off0000e762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE762 5384 bytes
SHA-256: c8cfb2466373611c7765283206cb4ae012f1a9ee53733d229d3f917d43f7676c
font_01_sfnt_off0000f9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A4 10544 bytes
SHA-256: 24157b3c89193ff440df70004cd6dcaa452d3259333374ebd2e4d49b4c9deb24

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