Malicious PDF — malware analysis report

Static analysis result for SHA-256 90e84ec1490951f4…

MALICIOUS

PDF

77.7 KB Created: 2021-03-27 10:13:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 6a90bbea1b6acb33e7530e0cdc4bfaba SHA-1: 0050596a360ee6289dad238491c614dae8a4ee1e SHA-256: 90e84ec1490951f4598bd0b3487ac72442631eeb6b05a1b625ac7df9d06ab790
126 Risk Score

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, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host a large number of links on disposable domains, a common tactic for phishing or distributing further malware. The embedded URLs point to suspicious domains, reinforcing the phishing or malware distribution attack pattern.

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://dugedepap.ru/strik?utm_term=is+hp+8610+airprint+compatible PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471683/normal_603d3f39e5f11.pdfIn PDF document text
    • http://nesorus.mywebcommunity.org/56209544817.pdfIn PDF document text
    • http://mutujejeturuduf.medianewsonline.com/92127290645.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390996/normal_5fd88691bf397.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489853/normal_5fc6775a8df20.pdfIn PDF document text
    • http://kakolamilasaru.medianewsonline.com/gosegimuxevubebifo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417659/normal_5ff87a8567ae1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500904/normal_5fcaa90c9d6a5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/fenilepirogoji.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/leditikopaletogamoxitu.pdfIn PDF document text
    • https://s3.amazonaws.com/zowibatev/devexpress_report_designer_vb._net.pdfIn PDF document text
    • http://mavuriwowul.myartsonline.com/split_mac_os_x.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0598cb6a-0af7-4d68-a6fb-8380dfbe3190/health_psychology_associates_reno_nv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a14ca7d-add2-4585-8ad4-90440b8448f4/sukenimogajapu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aee7e0bb-f7d1-4b18-ac71-a42ff3342e29/principio_de_placer_y_principio_de_realidad_freud.pdfIn PDF document text
    • http://miwewugewu.atwebpages.com/58887732148.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cf40480-32ff-40c8-a546-09924f1d7c3c/what_is_linking_words_in_english_grammar.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_off0000ee48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE48 5792 bytes
SHA-256: e776bb80a29e138852c403b7816cc3ec850660e27c76e7fdac796e75693a24a7
font_01_sfnt_off000101d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D0 11528 bytes
SHA-256: 288ac99d900db859eb12ae255c90572c1a21c757a113e7a43a85a9a09bbc396f

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