Malicious PDF — malware analysis report

Static analysis result for SHA-256 8495f4c158e3be66…

MALICIOUS

PDF

118.2 KB Created: 2021-02-26 09:59:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 5b3cb560e2824d5c9eb9df64b4c0120b SHA-1: c90740fd0e3e9686da485a1dc10146b16aea69af SHA-256: 8495f4c158e3be6677425124ba68c25502f740a45bc7defbbecb35ef571737d2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to host malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/award?keyword=suzuki+sidekick+engine PDF link annotation
    • http://lg-copyrightforms.com/589937527777emai.pdfIn PDF document text
    • http://legalvictory.group/nijujujalokuduwipazepelpdr8.pdfIn PDF document text
    • http://wersita.space/matepemawijufoxofajegabifnamw4.pdfIn PDF document text
    • http://vittorguxx.site/bavawikopujividaditodubok3coar.pdfIn PDF document text
    • http://avit0.cc/wopofuraxiwa1yvbv.pdfIn PDF document text
    • http://ihsteam.ru/acls_pretest_answers_2015ry798.pdfIn PDF document text
    • http://mklhhhh.space/costanzo_physiologyr1rrz.pdfIn PDF document text
    • http://dress-russia.ru/newil3k5f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468268/normal_5fe81a6eede1e.pdfIn PDF document text
    • http://creditreportfast.info/20996183050x4cqd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446399/normal_6010b4bf5736f.pdfIn PDF document text
    • http://4escam-bot.online/bodoni_bt_book_font_freei4txj.pdfIn PDF document text
    • http://abanca-electronica.com/brain_vision_analyzer_user_manual74tqv.pdfIn PDF document text
    • http://lighttravel-ng.com/math_practice_for_3rd_grade_online_freeov9qo.pdfIn PDF document text
    • http://idealica-ituficiale.website/gimonujezisogamaworoowv1r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dorulusof/comparative_degree_worksheet_for_grade_3.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/xonupisetediwapoz.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000141de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141DE 11876 bytes
SHA-256: 9dbcf5f98c6074d13168ec7fa32193b94f115128560c941befd21ca4aa890130
font_01_sfnt_off000168d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168D3 4676 bytes
SHA-256: 67b2b6621379b091c535308d43ef24b680811f6a72e05613c32cf7474c726172
font_02_sfnt_off000178bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178BD 15268 bytes
SHA-256: cb7c13cce3c226b211aa352612543d8adca7aab16cd53617647544e1f9d93413
font_03_sfnt_off0001a832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A832 16060 bytes
SHA-256: ae97ebdbf5cb6679ee3ae7f6f8963da9ec2437ada1f672a33085bc8cbe806833
font_04_sfnt_off0001bcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BCC6 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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