Malicious PDF — malware analysis report

Static analysis result for SHA-256 33688c22aad4e093…

MALICIOUS

PDF

77.5 KB Created: 2021-02-25 06:02:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1fd0c9cd10bf5dae9e3c26d5c1c969fd SHA-1: 6590c52cbd4191934d1f235bc9d7a474567e964a SHA-256: 33688c22aad4e093f5ff0d4f187579916fbb53b1ad18caab7c9a5dab885a2d75
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 0.9100

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 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
  • 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://baarspo.ru/wix?keyword=mla+worksheet+practice+works+cited+page+answer+key PDF link annotation
    • https://tarezusubem.weebly.com/uploads/1/3/5/3/135386237/9640987.pdfIn PDF document text
    • https://mitojebani.weebly.com/uploads/1/3/2/7/132711961/mivupemumuniju.pdfIn PDF document text
    • http://shop-onlain.fun/280143202993gxy5.pdfIn PDF document text
    • http://slimitalia.space/classroom_rules_flashcards_printable1yuy7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456989/normal_5fe3060a07d2f.pdfIn PDF document text
    • http://moneyindia.site/android_call_broadcast_receiver_from_service45boq.pdfIn PDF document text
    • https://xewidepomizexas.weebly.com/uploads/1/3/0/7/130775014/b5d8a.pdfIn PDF document text
    • http://8bitbeardsco.com/detemibbiwg.pdfIn PDF document text
    • https://gixoxiri.weebly.com/uploads/1/3/4/7/134707295/2707620.pdfIn PDF document text
    • https://wetenonuvodipu.weebly.com/uploads/1/3/5/3/135321676/994ec4aab0831cc.pdfIn PDF document text
    • https://givodevivunafa.weebly.com/uploads/1/3/1/8/131871579/7176b853f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368976/normal_5fd253285d26b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419832/normal_5ff4609286844.pdfIn PDF document text
    • https://kigijogi.weebly.com/uploads/1/3/4/7/134702755/7495339.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/dovulavavo/samsung_printer_m2880fw_software.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/80192368514.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/rubber_stamp_template_illustrator.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/nelodekeziju.pdfIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off00010ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE1 6744 bytes
SHA-256: b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808
font_01_sfnt_off00011fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC6 5600 bytes
SHA-256: cf2e8f19c7887ac030a48909dbd2bc8983feda49622850cd1b41153cbfbedd5d

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