Malicious PDF — malware analysis report

Static analysis result for SHA-256 e54678440729614a…

MALICIOUS

PDF

77.0 KB Created: 2021-03-02 14:16:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: cc5623a6b17aad45232c7ffd436e738a SHA-1: b52d5115ae3f110425e294014f721eee68e3b7ae SHA-256: e54678440729614a68f131104115093f9ae0840172cf3a4c3b42b4f48beff760
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to disguise malicious links within seemingly legitimate search result pages. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://pelibifir.ru/wix?keyword=motorola+hk250+headset PDF link annotation
    • https://xajakubadom.weebly.com/uploads/1/3/0/8/130874473/mogozob_wijujixenuzu_gosuvijezif_xakiza.pdfIn PDF document text
    • http://fadulifakibul.medianewsonline.com/ceh_certified_ethical_hacker_course_in_india.pdfIn PDF document text
    • https://kosukanawator.weebly.com/uploads/1/3/5/3/135304621/cada65fa.pdfIn PDF document text
    • https://cdn.sqhk.co/gorokipo/gjjhijf/21358028001.pdfIn PDF document text
    • https://cdn.sqhk.co/xojoreve/caGdege/31698551074.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415518/normal_6014494ad4100.pdfIn PDF document text
    • https://doritader.weebly.com/uploads/1/3/4/8/134885844/6f2c56e6c39.pdfIn PDF document text
    • https://cdn.sqhk.co/tenotitur/dBjh5gh/escape_plan_2_hades_rotten_tomatoes.pdfIn PDF document text
    • http://zixivudu.getenjoyment.net/6114956549.pdfIn PDF document text
    • http://trenolgia.buzz/kubota_d722_service_manual_downloadlhn4l.pdfIn PDF document text
    • http://hackins.site/lulazewexanozjcdcl.pdfIn PDF document text
    • http://tusiteguluvora.getenjoyment.net/lurovifulirim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377120/normal_6003301b3f177.pdfIn PDF document text
    • https://foxesomi.weebly.com/uploads/1/3/0/7/130775893/68c79.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475397/normal_5ff4c2f1c1aaa.pdfIn PDF document text
    • https://cdn.sqhk.co/lokiwejawe/mgj6HpH/91398468543.pdfIn PDF document text
    • https://xinosete.weebly.com/uploads/1/3/0/9/130968926/2592660.pdfIn PDF document text
    • http://lovelid.xyz/anomaly_detection_network_traffic_github6rg34.pdfIn PDF document text
    • http://storeyou.store/lisobe8n7xd.pdfIn PDF document text
    • https://kiriwalukejogof.weebly.com/uploads/1/3/4/3/134310578/xorinezenekimolaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04A 5380 bytes
SHA-256: 533faaf3a7c3efc822e14b1143d013c4e28c44aa48189a570ba3ef54333cac94
font_01_sfnt_off00010297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10297 10476 bytes
SHA-256: d2c3e49aa3574bbdca09921a87e8edf91a97c71d35880944fd209911fba288c1

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