Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8f62564c4af5aa…

MALICIOUS

PDF

86.5 KB Created: 2021-02-18 21:32:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0ae6ef29db4491c128b535883c07a773 SHA-1: 8f06f06e724ea1bb1c1dd1a1aa977e76bc117fce SHA-256: 3f8f62564c4af5aa67af4e6be0a9ea5e1fb65966d78ed68e9127b12c3dc42924
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to home repair, likely intended to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/123?utm_term=how+to+repair+a+leaking+bathroom+faucet+base PDF link annotation
    • http://pro-komp-master.website/ho_adivasi_dj_songs8z89.pdfIn PDF document text
    • http://alex-travel.moscow/562825109492ou1g.pdfIn PDF document text
    • http://detonic-buy.website/101648445891pxbr.pdfIn PDF document text
    • https://rixogeki.weebly.com/uploads/1/3/4/6/134693266/fofer.pdfIn PDF document text
    • http://best-store.club/2009_aston_martin_dbs_manual_for_saletn1is.pdfIn PDF document text
    • https://kodidorimo.weebly.com/uploads/1/3/1/3/131380292/rurag_pejureki_bavemabilax_nilumojaxipel.pdfIn PDF document text
    • http://devgm.design/hands_on_machine_learning_for_algorithmic_trading_githubwmme9.pdfIn PDF document text
    • http://drovazvenigorod.ru/37418347432hvbnx.pdfIn PDF document text
    • http://sberbank.services/combinaciones_con_repeticion_ejercicios_resueltoseigg3.pdfIn PDF document text
    • https://regamozinog.weebly.com/uploads/1/3/0/9/130969170/gorolugik.pdfIn PDF document text
    • http://bloomwithdeanna.com/famulijisoxulimieiiqw.pdfIn PDF document text
    • http://legionmone.xyz/allen_carr_book_free_downloadtjhhd.pdfIn PDF document text
    • https://lurofigugibax.weebly.com/uploads/1/3/4/6/134686006/zeragukepopebe_kisodako_ropina.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/folexapurilowe/fuvakupazuzezadugazepose.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/28810033335.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DF 5568 bytes
SHA-256: 5c44271a4e450e23efce74ae1caaa59cdce35d38f01e290a8eb37e42ff97da33
font_01_sfnt_off00011aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAF 10488 bytes
SHA-256: 36e84cf697e09f54ea89fb102261319831e7df7f7911cd176ea68ba2aa37376e
font_02_sfnt_off00013e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E54 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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