Malicious PDF — malware analysis report

Static analysis result for SHA-256 773c2d6dc22c9f28…

MALICIOUS

PDF

74.1 KB Created: 2021-02-13 09:54:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5a12d1fa5a57fec69f470a99eb690ba7 SHA-1: 59863c92212c9dcf27080fea98dafd442791e4e6 SHA-256: 773c2d6dc22c9f28919ab60fecaebbe7153d87b5433fc533527ca97b991ed67a
186 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 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://bologen.ru/wix?keyword=invisible+man+quotes+with+page+numbers PDF link annotation
    • http://bupatinewesep.66ghz.com/format_json_file_pycharm.pdfIn PDF document text
    • https://zujuwedidikaf.weebly.com/uploads/1/3/4/3/134375258/5083384.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471958/normal_5fcc0047e5e83.pdfIn PDF document text
    • https://pelefazefipaguj.weebly.com/uploads/1/3/4/8/134892892/sukuzasunazed_pemitabem_bijifefaf.pdfIn PDF document text
    • http://gusanod.22web.org/agri_application_form_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448547/normal_600273aa4f4ea.pdfIn PDF document text
    • https://tatonipek.weebly.com/uploads/1/3/4/8/134874136/wuwelawodizej.pdfIn PDF document text
    • https://jivefumo.weebly.com/uploads/1/3/0/7/130776755/nefewago_kaxusumilo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381102/normal_5fd355457c7f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445341/normal_5fd273787b3e5.pdfIn PDF document text
    • https://fekugutupufug.weebly.com/uploads/1/3/4/8/134876907/4faf192e24e96.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501810/normal_5fc725da5bdbb.pdfIn PDF document text
    • https://guvefivilemu.weebly.com/uploads/1/3/4/3/134397682/4303278.pdfIn PDF document text
    • https://fisenekapiwu.weebly.com/uploads/1/3/1/4/131437930/1364094.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/bubodeliza/52122735220.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/42553383733.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/retatezuteduz.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_off0000e3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E3 5588 bytes
SHA-256: 4f19942afd6669f235f1c14407709a030dcff73ac7c70bda96916af3c5880ab3
font_01_sfnt_off0000f6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C8 10640 bytes
SHA-256: 0c3c647479f4a3457f96a26338033fe903f44a812b7c2e38f5e1d27398438829

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