Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0e2cbdc46da9691…

MALICIOUS

PDF

68.6 KB Created: 2021-02-17 01:15:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 2c6d5de3fbf7eb8c492c375e81035dd2 SHA-1: 8735625d7c83639a8b63a056238036ad28eb878c SHA-256: b0e2cbdc46da969110b45613bfa486d5bdebb8d4bb863853df935a7845fed530
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection mechanism to host malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate attempt to obscure the final destination. The document body, though heavily obfuscated, contains metadata related to 'Actiontec mi424wr rev d default password' and 'wkhtmltopdf', suggesting a potential lure related to network device security or a fake information page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/aws?utm_term=actiontec+mi424wr+rev+d+default+password PDF link annotation
    • https://bufuxilanu.weebly.com/uploads/1/3/4/4/134402831/nojupovufoxoxi.pdfIn PDF document text
    • http://legujepug.22web.org/62796859970.pdfIn PDF document text
    • http://rakuwotakiko.22web.org/ziwikifomip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454043/normal_601e8f9e29c84.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451565/normal_5ff53c77535b3.pdfIn PDF document text
    • https://likufuzojelawaf.weebly.com/uploads/1/3/5/2/135298946/mizekikeziwozan-warerekafa-kutaj-kumozajupafeku.pdfIn PDF document text
    • https://ralanuda.weebly.com/uploads/1/3/0/7/130775203/1554481.pdfIn PDF document text
    • https://renikafajuwigag.weebly.com/uploads/1/3/4/3/134317319/640118.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371004/normal_5ffe6d5d50151.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500187/normal_60066a62298de.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
    • http://kenuxiximusopev.epizy.com/37678323292.pdfIn PDF document text
    • http://jizonizop.rf.gd/87257840746.pdfIn PDF document text
    • http://lilivuxaja.rf.gd/mexibasasolo.pdfIn PDF document text
    • http://numivonef.rf.gd/karan_arjun_movie_hd_song.pdfIn PDF document text
    • http://tukudizu.rf.gd/highways_england_traffic_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/android_studio_camera_vs_camera2.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/captain_america_full_hd_photos.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_off0000c0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C5 5544 bytes
SHA-256: 5ddab7e04513acc1aa3863f74af22274c303267f438d12831194c2e53550892e
font_01_sfnt_off0000d393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD393 10508 bytes
SHA-256: f769cc02a4dffb408323a8fa6a888701f996bf989488b702c61fc9ce7a970980
font_02_sfnt_off0000f754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF754 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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