Malicious PDF — malware analysis report

Static analysis result for SHA-256 415a8fda26e8794b…

MALICIOUS

PDF

76.3 KB Created: 2021-04-05 22:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8135ef7fa81ab3b2f4306c04097b8798 SHA-1: a9434b3788dbeed2c6f1f761b3cf9043c8e6c870 SHA-256: 415a8fda26e8794b7a5e2a93a8229c3188992e1a0d67ccf70a25309ca4239170
150 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing lure. It contains multiple external URIs, with a primary suspicious URL pointing to a domain associated with link farming and potentially malicious content. The document body, though heavily obfuscated, contains elements that suggest urgency and payment-related themes, further supporting a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 8

  • 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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://seumenha.ru/strik?utm_term=oster+clipper+repair+near+me PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366668/normal_6036bebf189b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458625/normal_600d2a1d8b49b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450257/normal_5fe6eff7777bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456685/normal_5fcf370038078.pdfIn PDF document text
    • http://tijudiwulewanuw.getenjoyment.net/nemubijofimabexalegof.pdfIn PDF document text
    • http://wekanisa.scienceontheweb.net/bhagavad_gita_telugu_explanation.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448719/normal_602d9f5ff0069.pdfIn PDF document text
    • http://zipubezexupoka.mywebcommunity.org/kilalesi.pdfIn PDF document text
    • http://jusojixanona.getenjoyment.net/mechanical_engineering_interview_questions_and_answers_book.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454670/normal_5fe051eb89753.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492240/normal_5fe4abf8cff4f.pdfIn PDF document text
    • http://instapriz.website/can_i_use_masonry_drill_bit_on_concrete2f9rq.pdfIn PDF document text
    • http://itslm.fun/rewuvoszkt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371265/normal_602aeff38c341.pdfIn PDF document text
    • http://keysecret.ru/94855202083qidp8.pdfIn PDF document text
    • http://busurman.space/56379785738sjxcn.pdfIn PDF document text
    • http://gsmall.space/xuzodusumajonao50w0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c8fbb4d-e5da-4073-9571-2e6ff6c50722/lost_islamic_history_by_firas_alkhateeb_in_urdu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa08384c-e245-459c-b6f5-fb5d86b46f00/asp.net_mvc_3_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7d185e3-6774-455b-bed1-6206abd59076/52204238486.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff4dd012-7552-4086-a82a-38fe5f8479f8/what_is_juul_batch_code.pdfIn PDF document text
    • http://bemabam.myartsonline.com/kaxebij.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_off0000ea52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA52 5104 bytes
SHA-256: 1eeac5b988b9ede068b5bd70c9f84c2414bffbf762919f0b2e5d02fce4669b54
font_01_sfnt_off0000fb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB95 11848 bytes
SHA-256: 502cdec37ef6fcfc19c1b33ed05af6ce222e387764e27379632a4f9f7e342ade