Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f75f40c33e7332b…

MALICIOUS

PDF

63.2 KB Created: 2021-02-14 20:39:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: bdf575aaf28f17dc740b988344a70b49 SHA-1: e3d21be2896b5b73fe1e3d08f969cba0f79ef934 SHA-256: 8f75f40c33e7332be7b9a7fad44146e5c216c8851343180bf0e676c53b06cb47
184 Risk Score

Malware Insights

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

The PDF contains numerous links to disposable hosting, a common tactic for phishing and malware distribution. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. While no scripts were extracted, the document body and embedded URLs suggest a phishing lure disguised as a download, likely leading to further malicious content.

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
  • 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 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.
  • 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://yafferge.ru/wix?keyword=khan+tv+download In PDF document text
    • https://sisuwupuwadigif.weebly.com/uploads/1/3/1/4/131437471/4294434.pdfIn PDF document text
    • http://winoorama.site/go_fish_poke_bar_locations5u386.pdfIn PDF document text
    • http://xipevufizokev.iblogger.org/carol_of_the_bells_metallica.pdfIn PDF document text
    • http://sdek-24.cc/pepeperotuguwurapggdfy.pdfIn PDF document text
    • http://meblik.su/gun_strike_ops_ww2_apkv4lyw.pdfIn PDF document text
    • http://banepudota.iblogger.org/bakers_biscuit_recipes.pdfIn PDF document text
    • https://fikuvigobe.weebly.com/uploads/1/3/4/5/134582673/6960652.pdfIn PDF document text
    • http://lovelyhouse.online/72014343025bum32.pdfIn PDF document text
    • http://zhigina.ru/h2020_consortium_agreement_template9bca1.pdfIn PDF document text
    • http://habercigo.com/google_earth_flight_simulator_apkotci4.pdfIn PDF document text
    • http://dle-tpl.site/convertir_anglais_francaisw3xq7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dumevurofif.rf.gd/jizuluvifepejezo.pdfIn PDF document text
    • http://wixesikive.epizy.com/serowexejipumuvenubuv.pdfIn PDF document text
    • http://bezixezejagu.rf.gd/ant_video_er_for_chrome_browser.pdfIn PDF document text
    • http://velupar.epizy.com/satera.pdfIn PDF document text
    • http://mowubuzedolilaf.epizy.com/19835514085.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_off0000bd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD07 4760 bytes
SHA-256: 3ee6f056382c3cc541596dd9eef63f01d96c2021926775833c1493adadc7efad
font_01_sfnt_off0000cd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD51 10168 bytes
SHA-256: 6ab570cd15cfe43caab452f08edd1bcc2735d4fe7a5d42ea60982147d69cbe30

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