Malicious PDF — malware analysis report

Static analysis result for SHA-256 c35d5d39fc3712b0…

MALICIOUS

PDF

75.9 KB Created: 2021-03-19 11:03:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: cd33731369831014cd71a5e77d9dad67 SHA-1: e9ed90f2e930295aa08a72e8cf5db2117dd35084 SHA-256: c35d5d39fc3712b085298d8ff33bc16b66632d7b4db44586d4abda8b0533a89f
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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://resalured.ru/strik?utm_term=eragon+movie+download+in+tamil+kuttymovies PDF link annotation
    • https://cdn.sqhk.co/mowezeto/ib9yChj/score_hero_hack_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/dodamewope/chejfcS/juletume.pdfIn PDF document text
    • https://cdn.sqhk.co/fovudadeweto/0gfhiid/arteriovenous_malformation_in_brain.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/hhhgih3/words_in_words.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/fnVNMXe/xexuviwiwururupa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sutejapikomi.epizy.com/sifuluxuwujegepu.pdfIn PDF document text
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_83e7ada9e0fb4362845fc5de42227ba5.pdf?index=trueIn PDF document text
    • https://f3c4034a-4a94-4c47-b6c5-0445626d7bf8.filesusr.com/ugd/655f09_20109b2bd6fb442cbecd1ff0073b8650.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kudefem/tasotoja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96ab18c9-5745-4f2c-922c-20122a22db9e/nazoto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b919d6e-ed7b-4c7c-bdac-e92d8e4dd1c0/gikejobutufofugoxasizarog.pdfIn PDF document text
    • https://c6506652-bf5e-4f52-be36-03dbfaede22c.filesusr.com/ugd/f74919_182017886f804318b504e2b8c547e2c7.pdf?index=trueIn PDF document text
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_58e19501653d4d7bbd8386813390704b.pdf?index=trueIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_87cb9757b6c94fbb88cb50d4a3f01f62.pdf?index=trueIn PDF document text
    • http://tewejifofobaj.rf.gd/sabrina_carpenter_sue_me_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c91dad55-a75e-4553-80f0-9eb921acbd32/forolejobe.pdfIn PDF document text
    • https://8b62b971-d575-4461-ae89-9de7a2afac08.filesusr.com/ugd/c5a911_5a158fc1f21942878ef6c5d5246d8b90.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/74769488029.pdfIn PDF document text
    • https://161abad2-7de2-49bb-9904-d6e2a620a662.filesusr.com/ugd/2eec94_c1442e418ff54e95b64bc151e5e73220.pdf?index=trueIn PDF document text
    • https://26bfc7ce-baa4-43a1-9280-72312523cbd3.filesusr.com/ugd/5af86b_e25607fcc36144e9b384ff4c39d9395a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d03bb46a-a6fc-4fbd-82ef-474527a85db0/lunarapoder.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ead3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD3 5420 bytes
SHA-256: 272cc18c549b132fd760d10752079f2964911876a931d353f3a39868bb2a2d70
font_01_sfnt_off0000fd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD46 10796 bytes
SHA-256: 08948c4ca997c8db334360d52f1d7bf7eacfc76e75a1da4e0ce83a48dc52020f