Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb1f471243bd62e9…

MALICIOUS

PDF

68.3 KB Created: 2021-03-28 01:12:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ce98cfbe9774ef93a1ce6f929d48712c SHA-1: 9e70fa67088f151aec212c2a002e901493b7a9bf SHA-256: fb1f471243bd62e9c84bf98bf7bec8f1eac2cd003a46d91e697f71d36888273a
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 0.9996

Heuristics 6

  • 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
  • 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://leonvi.ru/wix?keyword=biologycorner.com+plant+cell+coloring+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415080/normal_6034fb0b17445.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458633/normal_6010ebba89432.pdfIn PDF document text
    • http://tatajosak.22web.org/employment_application_form._docx.pdfIn PDF document text
    • https://munowimil.weebly.com/uploads/1/3/1/4/131406650/magedosalix.pdfIn PDF document text
    • http://pubaninuw.22web.org/xaxapigakujunabezapugi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451348/normal_6008eb3b8b90e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423431/normal_6056ab3e99a56.pdfIn PDF document text
    • https://cdn.sqhk.co/detokelixipi/ejc9Jjd/receiving_international_calls_sprint.pdfIn PDF document text
    • https://cdn.sqhk.co/dokamaruxif/KhhQiam/mutants_genetic_gladiators_hack_apk_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368238/normal_5fe8751c93cd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454545/normal_602b50380e297.pdfIn PDF document text
    • https://dovejopizodumu.weebly.com/uploads/1/3/4/8/134883147/1493158.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487918/normal_5ffac1aae1de8.pdfIn PDF document text
    • https://cdn.sqhk.co/zeboxuze/jaiiEdM/53028573871.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445864/normal_6030a3a25f7e5.pdfIn PDF document text
    • https://cdn.sqhk.co/zatejurix/ggKjiUB/5788305772.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://titomozuluvexov.epizy.com/walivavirovisijelumugom.pdfIn PDF document text
    • http://jewuwururutaf.epizy.com/fraction_addition_and_subtraction_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9c1ea23-a24d-4511-9def-120987e9f9ae/85137125139.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7eb9d721-0fde-46f4-931d-4200d42c3299/tatovasidu.pdfIn PDF document text
    • http://zasegusof.epizy.com/cavernous_malformation_migraine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b34d469-2c15-4a61-a88e-b7714716037f/kibova.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_off0000ce21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE21 5592 bytes
SHA-256: d0c4e37bfc75771583736cc915f73c657da500aa75bddcfe869aea8df2a2a769
font_01_sfnt_off0000e13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13D 10096 bytes
SHA-256: 832a8058ca1484d9960e86bcf51ca12a9639a8f274cfd785c83cf1243bef4755

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