Malicious PDF — malware analysis report

Static analysis result for SHA-256 e535f03376aefb62…

MALICIOUS

PDF

84.2 KB Created: 2021-03-24 23:54:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 30628f8eb9985f1590b46819d31e20be SHA-1: dffda0d710065e29f67d4b00aa1538d84f60fd86 SHA-256: e535f03376aefb62c5ca2da439dc2d073be57aabf1272f379b65c1d7e2b6bef2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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-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://maypoin.ru/strik?utm_term=kidde+kn-cosm-1b+manual PDF link annotation
    • http://umkatrade.ru/694835671950et5t.pdfIn PDF document text
    • http://whitecheat.xyz/cherokee_flexibles_uniformsg9n1w.pdfIn PDF document text
    • http://salonvarna.com/38165373852q6qif.pdfIn PDF document text
    • https://cdn.sqhk.co/rumoligodo/hajcIOV/30124205232.pdfIn PDF document text
    • http://gatorama.site/kazowazimijunevejiyu1mz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366335/normal_5fc918d22df39.pdfIn PDF document text
    • http://optamorem.com/hyperion_dan_simmons_tv_seriespn673.pdfIn PDF document text
    • http://hallop.xyz/aaoge_jab_tum_sajna_ringtone_freeifloc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459329/normal_5fdad9f8e2503.pdfIn PDF document text
    • http://top-odejda.com/quran_pak_in_english_download3482o.pdfIn PDF document text
    • https://cdn.sqhk.co/wofunukasu/bgdbgja/32550815597.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412591/normal_5feafd87a1cfd.pdfIn PDF document text
    • http://de-bewertung-id-q2e5t23.top/kesorld5s5.pdfIn PDF document text
    • https://cdn.sqhk.co/womibakok/I80jcia/marvel_comics_online_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428335/normal_5fffaf7a8123f.pdfIn PDF document text
    • http://odebayitrafikhizmeti.com/logitech_c920_manual_exposured45gv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/65602942078.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/5799972812.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/nanewufeluxutiwefirixa.pdfIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/66729000915.pdfIn PDF document text
    • https://s3.amazonaws.com/subopukomanaw/abiertamente_2.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_off00010c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C35 5248 bytes
SHA-256: 854df07dbdfe953175e0dc068f9e6acda10359ba996ce2ee1321105780d8ddff
font_01_sfnt_off00011e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E08 11188 bytes
SHA-256: f3dc3252b8ace1ed432df441b769264af141c0d5838e1891f68b8dd84dda1894

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