Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c51f590e7cd9532…

MALICIOUS

PDF

75.3 KB Created: 2021-04-05 14:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 64764771b4112d543a882f684a183274 SHA-1: 08699884bfbcd4afdd2a45ee64e4fe1715c896fa SHA-256: 6c51f590e7cd9532c051825f840c30c2f2109ee378fb3794e206bef83e6f9754
184 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, suggests a lure related to property rights, likely intended to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=example+letter+relinquishing+rights+to+property In PDF document text
    • http://interbankdigital.com/bus_simulator_ultimate_more_routeskavd2.pdfIn PDF document text
    • http://fofiwafajelerax.sportsontheweb.net/tafekujugusisufuvijexixa.pdfIn PDF document text
    • http://my-credit.info/stihl_ms180_chainsaw_costwkajr.pdfIn PDF document text
    • http://muzomabavima.medianewsonline.com/gojixazonerapusepunivudu.pdfIn PDF document text
    • http://dabopoxele.getenjoyment.net/31754492029.pdfIn PDF document text
    • http://thecabinets.xyz/h2o_x5_steam_mop_manual25qy3.pdfIn PDF document text
    • http://bezprovodov.guru/m3u_premium_latinoxu3gl.pdfIn PDF document text
    • http://wafowufopenu.22web.org/65968628198.pdfIn PDF document text
    • http://mizebojusur.mypressonline.com/hp_designjet_500_troubleshooting_guide.pdfIn PDF document text
    • http://igme.site/6327815025656w8r.pdfIn PDF document text
    • http://xenuven.22web.org/25857291317.pdfIn PDF document text
    • http://matawobedopikam.mywebcommunity.org/26508645771.pdfIn PDF document text
    • http://kovafuwir.getenjoyment.net/fojoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ad060920-74d0-4a59-a46a-f478898ed72a.filesusr.com/ugd/a7c1e6_2b9e6a66670145f3800c2743f8790da7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lixuzo/washington_football_records.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/pixalun.pdfIn PDF document text
    • http://vuwepapol.rf.gd/43222281342.pdfIn PDF document text
    • http://rodedewezijore.atwebpages.com/saga_caballo_de_troya_gratis.pdfIn PDF document text
    • https://a6053a4b-6066-498d-92a8-7748b68531bc.filesusr.com/ugd/5f0d2f_e0b7b67aa5734eb3bf3a64120661d24d.pdf?index=trueIn PDF document text
    • http://mowixir.epizy.com/limuxajo.pdfIn PDF document text
    • http://jemileti.atwebpages.com/vejajagopagizuf.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/73260320698.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/protexin_cobalaplex_data_sheet.pdfIn PDF document text
    • https://fb5b3b17-6e6a-47c5-ae49-26eddba71e57.filesusr.com/ugd/aff7be_a1844207fbcf42f9ad11703655449377.pdf?index=trueIn PDF document text
    • https://df4002df-ed14-466c-b758-10ced248c840.filesusr.com/ugd/3b03e6_4c61cca6d31f48bf894232cf3db97437.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_off0000e9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FA 5484 bytes
SHA-256: 464ebf8d92768560a44b53a65fa6e2ce67bae86b9bf4b1550201780156b15b4b
font_01_sfnt_off0000fc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7F 10152 bytes
SHA-256: 4d8106d11cf62e7f48a0d4f6b09cea46d316758ea49ce6bb07545da3e7d84ce0