Malicious PDF — malware analysis report

Static analysis result for SHA-256 d41778843b5b4666…

MALICIOUS

PDF

104.4 KB Created: 2021-03-30 05:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d27eee99fcdb8d5a5bd984ab893ef575 SHA-1: 3a6a3e70ea8f58575d0b0cd05f6e96d3e320771a SHA-256: d41778843b5b4666ed2fac4367961cc5589cad8934c9ac73cc64d0938efcb84e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 5

  • 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.
  • 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://nipisod.ru/wix?keyword=cardinal+directions+worksheet+with+answers PDF link annotation
    • http://katerevemoposab.iblogger.org/bloon_tower_defence_5.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/70631188984.pdfIn PDF document text
    • http://tuderoba.getenjoyment.net/robotics_engineering_for_beginners.pdfIn PDF document text
    • http://sekekejawewonul.iblogger.org/measuring_triangle_angles_with_protractor_worksheet.pdfIn PDF document text
    • http://pinopizo.sportsontheweb.net/1505950615.pdfIn PDF document text
    • http://vuzuwul.getenjoyment.net/bjorn_lomborg_cool_it.pdfIn PDF document text
    • http://fulifubajamo.mywebcommunity.org/cabin_crew_interview_questions_and_answers.pdfIn PDF document text
    • http://repovor.22web.org/18255272353.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
    • https://e905e09d-7ddd-4aab-833c-73500e817873.filesusr.com/ugd/f4c08b_cf0e330c98bb42a48f191af15a943c15.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuwosil/fitiputuzuxawuzetuvanepad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1092c6d2-12e6-447e-b9fa-db1cddccec07/54299326858.pdfIn PDF document text
    • https://s3.amazonaws.com/girilifawuxi/kompetencesekretariatet_team_guide.pdfIn PDF document text
    • https://52a72965-a6d2-471e-b66a-59a59a4d663b.filesusr.com/ugd/e643da_8f03be18c0a6431495902d0d33d2873d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/89883188469.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd844def-77c2-408d-8a6c-57fbb2f0fee7/boxabokokadatasum.pdfIn PDF document text
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_e5ba439fc44a4572a1d4baac85faa9fc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/2852758830.pdfIn PDF document text
    • http://merowijesajov.epizy.com/nacionalismo_que_es.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/adobe_lightroom_cc_mobile_presets_free.pdfIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_afccc33bbbd04cbc8edd5e0e537d50e3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/tripadvisor_new_york_guided_tours.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14581 2828 bytes
SHA-256: 85b692c1c636aed9ab1240d2a7361179fdd6c0849396a06064984f922e967b4f
font_01_sfnt_off00014f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F7B 4992 bytes
SHA-256: 46c0162bd1dfda0ea566fd9ce5738360ae512290efc7b3ec47483429650111fe
font_02_sfnt_off00016079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16079 10120 bytes
SHA-256: 356bb22ac9ad5f70fc179c3d387454dfc6809e053ad3233502518da9853124cf
font_03_sfnt_off000182d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182D0 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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