Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e84687d3db188b…

MALICIOUS

PDF

84.0 KB Created: 2021-03-10 15:03:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: bdc4c5fe0069b99897c6b39ced99d76b SHA-1: 42731e09e3307431791c3f2d53d95b7ba1e630db SHA-256: 99e84687d3db188baea28fc31030d05452736bbb3bf2cb9b979005d8d2d7ae15
126 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, which is likely used to redirect users to a malicious website. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. The document body, though heavily obfuscated, contains text related to search queries, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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/award?keyword=hunger+games+vol+1+pdf+ita PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489740/normal_603b23602210a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446286/normal_5fcf1fdfd6cb2.pdfIn PDF document text
    • https://cdn.sqhk.co/gujadozede/fhjTicy/nye_ball_drop_2019_live_stream.pdfIn PDF document text
    • http://kifikawi.66ghz.com/36586511179.pdfIn PDF document text
    • http://gemofesane.medianewsonline.com/61193792393.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448096/normal_602b8fb445786.pdfIn PDF document text
    • http://lusolakidareve.mywebcommunity.org/walker_brothers_cowboy_story.pdfIn PDF document text
    • https://cdn.sqhk.co/mavixuwaloz/oqDkEhf/49480610300.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473049/normal_5fe57b34a3d63.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://73856814-13bb-4d44-aeaf-752cce6ba6bd.filesusr.com/ugd/a0d21a_2441aea613fb4706b1d97c3678552dd5.pdf?index=trueIn PDF document text
    • http://tejajageduvutu.epizy.com/67452897984.pdfIn PDF document text
    • http://zaximibirada.epizy.com/werobugozageralijizu.pdfIn PDF document text
    • http://bututifeb.epizy.com/absorption_chiller_cycle.pdfIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_6f9d199454c643f5867f540838ca32f0.pdf?index=trueIn PDF document text
    • http://boxokur.epizy.com/tebeviziwaritomo.pdfIn PDF document text
    • http://wesokojoposad.epizy.com/android_notification_not_visible.pdfIn PDF document text
    • http://sesiperuvi.rf.gd/shs_form_137_template.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_off00010d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2C 5432 bytes
SHA-256: 8c937ec542e9887767791c0a955de6e41363f3ec4c7b39f3cac0030247c5a4a2
font_01_sfnt_off00011fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA4 10408 bytes
SHA-256: 916ba17b4a6a972add53b6bb199e5670d982628451da9c1ed267cc7c9a61b84f

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