Malicious PDF — malware analysis report

Static analysis result for SHA-256 fec552b98fbf0936…

MALICIOUS

PDF

106.6 KB Created: 2021-03-13 18:43:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c21e4b6457065d68b2965170e4138c0b SHA-1: ebace11987e69a54782abcfa267130c65d69a6d0 SHA-256: fec552b98fbf0936840cdc4b7c4c33af99e2de135303ab8cec6e78c6cffa35f2
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 0.9997

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://fokemale.ru/wix?keyword=ls+862+heads+good+or+bad PDF link annotation
    • https://cdn.sqhk.co/sinemajud/VhcchQb/capitalist_economy_history_definition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409395/normal_603cc55d2a781.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414852/normal_6031b3f45376a.pdfIn PDF document text
    • https://lugukeku.weebly.com/uploads/1/3/1/4/131407734/2138872.pdfIn PDF document text
    • https://risogaruwakev.weebly.com/uploads/1/3/4/6/134634919/9c876549487.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494436/normal_600cca626bd07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365652/normal_6017b4fea9394.pdfIn PDF document text
    • https://galekogikelubem.weebly.com/uploads/1/3/1/4/131438025/e2053a5a1b105c.pdfIn PDF document text
    • https://cdn.sqhk.co/kefekawit/uhahcid/26335791552.pdfIn PDF document text
    • https://cdn.sqhk.co/tinulafi/Ohfiahf/4_in_a_row_king.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://uploads.strikinglycdn.com/files/3a97aac5-0209-4bae-b8a8-1b9c17f0a8e7/saffire_pro_40_catalina.pdfIn PDF document text
    • https://ccd4a2e6-63e2-4dcb-a02e-1ae1253dabcc.filesusr.com/ugd/059ff1_a9de8e4c95994155bee0b3e7558a1c05.pdf?index=trueIn PDF document text
    • http://zugotival.epizy.com/newest_itunes_for_windows_10.pdfIn PDF document text
    • http://tezipibuboxigo.epizy.com/garadedipunorigevogofe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc2ac7cb-d657-4a52-9d0f-af6d54a81352/housing_for_sex_offenders_in_austin_texas.pdfIn PDF document text
    • https://8b8c7005-3af0-45a1-8e5b-a6902caa9335.filesusr.com/ugd/dbd7d9_7d19235aae8a44f8aa3d86f36ac3d17b.pdf?index=trueIn PDF document text
    • http://bedanodog.rf.gd/judeluvatutez.pdfIn PDF document text
    • https://564fd4a8-0e6d-4f97-813a-a14a70c45316.filesusr.com/ugd/f90d28_8eb62e2f46ae46578ddaf3a15265bad5.pdf?index=trueIn PDF document text
    • https://944bcc21-9f45-42c2-9889-8cf837fa5d1c.filesusr.com/ugd/50f869_2a00f1888ce044d69b4387651fd8ef99.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000156ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156EA 5168 bytes
SHA-256: 890f919a19374aa96f317e16c9bc055219c7d703717067fa784dd70d687af93c
font_01_sfnt_off0001686e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1686E 11184 bytes
SHA-256: 8825f0c31d17c3187b342a36d4dad4f7fd88ef9e7f499b5543d665a6680c3273
font_02_sfnt_off00018e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E6B 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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