Malicious PDF — malware analysis report

Static analysis result for SHA-256 211f9f0adde521de…

MALICIOUS

PDF

83.9 KB Created: 2021-03-21 08:17:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2bb72fdf154799158e37260c975269d7 SHA-1: 5d63b53c4c896c22bf24ae4b9561f899c1f49d38 SHA-256: 211f9f0adde521de052516866dec66e0be60f53f2e7c3908e762acbd57f49e93
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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/award?keyword=basic+english+assessment+test+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462038/normal_603330947a031.pdfIn PDF document text
    • https://loloxemevo.weebly.com/uploads/1/3/0/7/130739498/6036c38c644b2.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwadezab/iijhdhf/jexifimavinupoxu.pdfIn PDF document text
    • https://gukevejulolun.weebly.com/uploads/1/3/2/3/132302942/5273614.pdfIn PDF document text
    • https://cdn.sqhk.co/gagadobuv/Ii19hbJ/81030366596.pdfIn PDF document text
    • https://zosifoke.weebly.com/uploads/1/3/0/8/130813504/8cff3.pdfIn PDF document text
    • https://ruvedusipokowu.weebly.com/uploads/1/3/0/8/130813644/gavuw_segapebef.pdfIn PDF document text
    • https://cdn.sqhk.co/vifekodilevi/idOzvji/3_mystery_words_level_3.pdfIn PDF document text
    • https://faliroralomi.weebly.com/uploads/1/3/0/8/130874474/widuwikoselolot_wetupele_fabonerikuvi_lajakovukip.pdfIn PDF document text
    • http://lamomusexosefe.66ghz.com/budismo_zen_y_psicoanalisis_fromm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470211/normal_60289a69a1cae.pdfIn PDF document text
    • https://puxasuzad.weebly.com/uploads/1/3/4/3/134352875/5243125.pdfIn PDF document text
    • https://cdn.sqhk.co/wufevinek/H3Vhbhg/air_attack_2_mod_apk_unlimited_money.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393356/normal_600e3430b5c40.pdfIn PDF document text
    • https://pixadodo.weebly.com/uploads/1/3/2/7/132740612/sadenarun_sagepod_paxibijoletob.pdfIn PDF document text
    • https://vakogupomuniv.weebly.com/uploads/1/3/4/6/134610568/8955502.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/GkjgzZ2/brilliant_vinyl_mystery_box.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bidexegope.epizy.com/mozexogenuzada.pdfIn PDF document text
    • https://8ed6bd9f-de2b-4923-b7df-82f95eb18a03.filesusr.com/ugd/7fa32f_c9fc479e97cb44acb483a9d6756089ed.pdf?index=trueIn PDF document text
    • https://52cfbdcc-51c1-4e85-ba83-ad74149b4620.filesusr.com/ugd/93d431_3e3777e81a204dc0afd9d8eb68431a23.pdf?index=trueIn PDF document text
    • https://30cc9e9c-6145-4029-bfdc-d0561bdb3a10.filesusr.com/ugd/0dcf4b_f134629354c04cdea6986e94bc835c0f.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_off00010afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFE 5524 bytes
SHA-256: 92deb1b6698df6733b0ad36c082506efa49784e951f912dcc5c475e754baba8c
font_01_sfnt_off00011da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA1 10828 bytes
SHA-256: 4ed44ecc3fca1cae8770f013b156c0722088f7c911bb15c3c3d0a88774d35455