Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ffc663a7035b29…

MALICIOUS

PDF

73.9 KB Created: 2020-11-25 05:39:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 27c56a727862da0e2e195ec3b42934d4 SHA-1: 10ef8e119192f18284d716b7761709fe18153dd3 SHA-256: b5ffc663a7035b29fdcf9bbb770af457df8c373a485980ef2de1f73c012216d8
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-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://traffnew.ru/aws?utm_term=bigg+boss+season+3+yesterday+episode PDF link annotation
    • https://nuzimalufugi.weebly.com/uploads/1/3/4/7/134705392/loletodepagidulefeme.pdfIn PDF document text
    • https://kijenelix.weebly.com/uploads/1/3/4/6/134612576/saduzila.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/zujobis-bogutuxufat-zepajawo.pdfIn PDF document text
    • https://tipefejiri.weebly.com/uploads/1/3/0/9/130969755/65100f.pdfIn PDF document text
    • https://nupanirofedodav.weebly.com/uploads/1/3/4/4/134470916/524b71bcea.pdfIn PDF document text
    • https://rabexowubomisuw.weebly.com/uploads/1/3/1/4/131407155/3cb2a247.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/1390cc03-75ec-4b9b-a7a2-44e42314fdae/76418316029.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83a4f968-2828-4362-97cc-d0c9cd2a5c57/89892994101.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/akali_s9_moba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d320619-918e-4ecb-97cd-d74394fd4adc/kirkpinar_gureslerinin_yapildigi_ala.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e09cbb1-77a6-4c09-a416-6993ef64f5b2/media_and_culture_10th_edition_downl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd416efa-b23d-4532-a7f0-b7ea29512ecb/black_ops_2_sniper_class.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD070 5548 bytes
SHA-256: bbffcad0b957e0e2efea22f6d1d1afb85ffa13b3123f46d981efe5676c0f8a76
font_01_sfnt_off0000e363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE363 5308 bytes
SHA-256: bda705a09a94a803c6bae543dd15a3667b71ed87da92b965f735f8c74659cfaa
font_02_sfnt_off0000f543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF543 10240 bytes
SHA-256: 7fd7cf44d297cfd4a0e9aa1f2ea5bca54bf857aba1d9e40df52273a7c2b4e43e

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