Malicious PDF — malware analysis report

Static analysis result for SHA-256 66574a54ebdf658c…

MALICIOUS

PDF

74.9 KB Created: 2021-03-29 10:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 18ecd5ba5612e47285569be07740ac4d SHA-1: 5da315b756e9c06ac2e327bdffb179cfc871560f SHA-256: 66574a54ebdf658c8a3fa17787f8873d4dd59897ea3f28c865648c54cedea31b
252 Risk Score

Malware Insights

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

This PDF file is identified as malicious due to its redirection to known malicious infrastructure and its participation in a link farm hosted on disposable domains. The presence of a 'download' button lure suggests an attempt to trick users into downloading further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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
  • 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/award?keyword=brush+up+your+english+pdf+download In PDF document text
    • https://zujomesesewega.weebly.com/uploads/1/3/4/9/134902804/vosurumojil.pdfIn PDF document text
    • https://vugogirofezufus.weebly.com/uploads/1/3/4/3/134355312/pejesimiborod-nazip-vegawa-ripilivewizuzib.pdfIn PDF document text
    • http://sunugukumota.getenjoyment.net/899794622.pdfIn PDF document text
    • https://vigoxanumevu.weebly.com/uploads/1/3/4/4/134466257/tidezanisikut-zilosetuj-tozitaxoxeraxuk.pdfIn PDF document text
    • https://wilulesutazi.weebly.com/uploads/1/3/3/9/133997377/bemiwanajefeniz-mopuzesibos.pdfIn PDF document text
    • http://sexedate69.site/251721622043ew1x.pdfIn PDF document text
    • https://wepotupibir.weebly.com/uploads/1/3/4/8/134881259/9124185.pdfIn PDF document text
    • https://lumigoxodavi.weebly.com/uploads/1/3/1/6/131606620/2397770.pdfIn PDF document text
    • http://fixmarker.fun/bisigibowegerog72m91.pdfIn PDF document text
    • http://rasudilikid.mywebcommunity.org/kifarupesatanad.pdfIn PDF document text
    • http://zuvatewovu.scienceontheweb.net/bukhari_sharif_in_english.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369179/normal_5fe320b6756f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368991/normal_5fde08012c83c.pdfIn PDF document text
    • https://radimedogotisig.weebly.com/uploads/1/3/0/9/130969281/3dbb0e6ce61.pdfIn PDF document text
    • http://madamzero.com/hardware_store_new_orleansuwzpi.pdfIn PDF document text
    • http://basumoxivor.sportsontheweb.net/femuwobaruxe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465262/normal_5ff9fe1c2f6f8.pdfIn PDF document text
    • https://wawodupalise.weebly.com/uploads/1/3/4/6/134621762/1298308.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377380/normal_6037e3d3cfe60.pdfIn PDF document text
    • http://arm-watch3.club/avatar_full_movie_hd_tamila3uv1.pdfIn PDF document text
    • http://newipufisatag.scienceontheweb.net/dakobaputo.pdfIn PDF document text
    • http://dsv-trening.ru/zunojinepizamepavitunistkjy4.pdfIn PDF document text
    • https://telapawuwa.weebly.com/uploads/1/3/5/9/135964826/4267956.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3ecb585b-79b8-4502-8567-d9a17299c5c1.filesusr.com/ugd/4b874d_3ec632fb7f4a4465988d695ad1df2734.pdf?index=trueIn PDF document text
    • https://f499a9ea-5579-4d3c-a180-ba191067f9b7.filesusr.com/ugd/34ec99_5486065521274797833321ce060383cb.pdf?index=trueIn PDF document text
    • https://f635e5d9-31b1-4f19-b758-7a623be10181.filesusr.com/ugd/6cf0f5_b683e4f324f84799b924d5b9278a7555.pdf?index=trueIn PDF document text
    • https://b3159766-6c8b-4733-a97d-e59ef6783693.filesusr.com/ugd/21851e_d81f152d182d44bcabd548f3798cf7d0.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_off0000e27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27B 5544 bytes
SHA-256: 6dfaf51df7ece1e7a83e66fbca05bb98c55be1ab65338aae4bc332e29ef07604
font_01_sfnt_off0000f570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF570 11708 bytes
SHA-256: 011841dad978bd5b344b2a9fd8595dd28c3ec823b89b4d1ce690f443eb823f62

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