Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d899940985ec6f8…

MALICIOUS

PDF

89.7 KB Created: 2021-04-02 12:41:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 3e5b23a2d549c3264e7f3fc7a907cfeb SHA-1: ed952479ccfdf4fd0028930365aa40d0ccc40e2e SHA-256: 2d899940985ec6f8e84efddad0484f816389c1a5468bab15cb79961caa4ddf82
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a high volume of links, with one pointing to 'http://fastgetme.online/reserezu2wmwq.pdf'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/strik?utm_term=how+to+connect+ipega+to+call+of+duty+mobile PDF link annotation
    • http://fastgetme.online/reserezu2wmwq.pdfIn PDF document text
    • http://hq-cleartv.info/vogabesevedesozenuvuru3bt2l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366036/normal_5ff0ca64a30dc.pdfIn PDF document text
    • https://ligiponofejejo.weebly.com/uploads/1/3/4/3/134346234/1324634.pdfIn PDF document text
    • https://vifojozajo.weebly.com/uploads/1/3/1/4/131454549/d8aa02de8aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462992/normal_604825586be07.pdfIn PDF document text
    • https://wajovojov.weebly.com/uploads/1/3/4/6/134652085/b68e9275e7b57c.pdfIn PDF document text
    • https://dusaxufar.weebly.com/uploads/1/3/5/3/135327992/f7f24b9382d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386334/normal_600cb49eadf81.pdfIn PDF document text
    • http://samo-katim.ru/can_f_test_be_two_tailedzklbm.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/wiwuxot/guidelines_for_hypertension_in_elderly.pdfIn PDF document text
    • https://4d75d3c9-3a4d-4df6-84ab-e48b83d723e5.filesusr.com/ugd/cdb50c_aae6791a34974cfda847251b371fd1db.pdf?index=trueIn PDF document text
    • https://2e4b0ed6-c237-476e-b23b-7c95f147629f.filesusr.com/ugd/30e930_0b5cc2da535b439bb8627188051ba4ad.pdf?index=trueIn PDF document text
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_b3c6ca2ade2c43b0be2d2f3e0f986e6b.pdf?index=trueIn PDF document text
    • https://53002a68-e35f-4167-ac88-1ab9777d7e72.filesusr.com/ugd/f5bc2a_dcc8f251f86c4cf78a31d4d0f60f2064.pdf?index=trueIn PDF document text
    • https://42cc6f6d-9125-48bc-bce4-1bf15f49b1be.filesusr.com/ugd/7c30af_5d82b679db264f8cb1a70a139bb1b6ad.pdf?index=trueIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_caca4357dc8f4ea29a1da798693d0b5f.pdf?index=trueIn PDF document text
    • https://0ed30ddb-3df1-4505-9e4e-3e87fc6d20ea.filesusr.com/ugd/f043c1_cba382fed0fd4357bdbd1918c968dfad.pdf?index=trueIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_e2f678d9cfba43f7bb0d0db72f48550e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/fashion_nova_black_formal_dresses.pdfIn PDF document text
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_cd99081daa6246cdaf9bdb2b56124c8c.pdf?index=trueIn 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_off00011df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF9 5496 bytes
SHA-256: 3097d53f1873f34baaab7840ab48f908aa6eac4068fd885f8c32c52e9b80902a
font_01_sfnt_off000130b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B7 12104 bytes
SHA-256: f4f863de19f61c358d9e63fe8795e93dfdd5ff82dfd6857fcc67039ed28917b9

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