Malicious PDF — malware analysis report

Static analysis result for SHA-256 920f49db2d9023db…

MALICIOUS

PDF

84.2 KB Created: 2021-03-25 16:10:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d6d33162b229233027ff42e990ac8b7 SHA-1: d7c4e52c22d335014cfb28a0d488ddcb73a2875c SHA-256: 920f49db2d9023db08b439d00c2158fc7ea344dacf3bd45d62853afaa5120f25
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection mechanism for malicious content. The embedded URLs and the PDF structure indicate an attempt to lure users to external sites, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/award?keyword=amleto+pdf+download
    • https://gatepeduvemixif.weebly.com/uploads/1/3/4/6/134669895/kifenotu.pdf
    • https://cdn-cms.f-static.net/uploads/4412396/normal_601553acc9fb3.pdf
    • http://moxolesapudeli.22web.org/animator_job_information.pdf
    • https://cdn-cms.f-static.net/uploads/4426425/normal_605b42f702b40.pdf
    • https://bosamekuxukis.weebly.com/uploads/1/3/4/6/134672370/2162161.pdf
    • https://numeroluxovuz.weebly.com/uploads/1/3/4/7/134733954/rolalene-kixuvusobak-biguvalutinetox-buredud.pdf
    • https://static.s123-cdn-static.com/uploads/4471234/normal_5ff3c05531531.pdf
    • https://gozerezujokosas.weebly.com/uploads/1/3/4/8/134856803/resomekuketosowijuk.pdf
    • https://vaxatimiroxak.weebly.com/uploads/1/3/4/6/134617636/mamalofirifabog_riwawotugewor_petopob.pdf
    • https://funavekun.weebly.com/uploads/1/3/0/9/130969801/pexatalafiregu-bozomo.pdf
    • https://cdn-cms.f-static.net/uploads/4497093/normal_60325df6a9946.pdf
    • https://cdn-cms.f-static.net/uploads/4457008/normal_60531bbb3f204.pdf
    • https://bafonalilazuxi.weebly.com/uploads/1/3/4/7/134731076/7dff33f049.pdf
    • http://bedesatef.22web.org/29486668076.pdf
    • http://merogerofame.66ghz.com/alaska_waterfowl_guide_license.pdf
    • https://cdn-cms.f-static.net/uploads/4454668/normal_602f4f8db1710.pdf
    • https://befugusugub.weebly.com/uploads/1/3/2/6/132683140/bebazojatasemimana.pdf
    • https://simokodopegaliw.weebly.com/uploads/1/3/0/7/130776428/zojixutaxub_tesip_palaseposave.pdf
    • https://fogorito.weebly.com/uploads/1/3/5/3/135322632/buboxiteguli.pdf
    • https://cdn-cms.f-static.net/uploads/4389394/normal_603262779e5d4.pdf
    • https://cdn-cms.f-static.net/uploads/4445754/normal_5fd7b30f9b64d.pdf
    • https://static.s123-cdn-static.com/uploads/4500904/normal_5fe09b96b4bdb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/460bbc2e-7d6d-48d2-b8fe-3cf88fce7ef2/pevijuvowiterukeveb.pdf
    • https://uploads.strikinglycdn.com/files/0a5e2b7f-c3bf-4e52-bf85-57fcb7ed12dd/52951036675.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010998.bin
2e0b59f7f476f5ed76b2c1284a6fa7ed6660bd22f8479a4223e052f16d3ba9b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10998 4992 bytes
font_01_sfnt_off00011a9c.bin
9f6302d1909a4c63bed3c2daaf066a8d0d392cff601c7a39266be4a5916ac9ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9C 12300 bytes