Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b3676c91b4ac25…

MALICIOUS

PDF

99.2 KB Created: 2021-03-08 06:15:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: c84dda7151f57d90455e268855192dad SHA-1: 627526e6afca18aa84dbf061ea66b04bf3e241a8 SHA-256: d9b3676c91b4ac25ac86381c53f2a9a44781ddab40beaf9024265a46a253699d
134 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this deceptive practice.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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://druttle.ru/wix?keyword=synthesis+of+alum+post+lab+answers PDF link annotation
    • http://idealsit.fun/taurus_pt111_g2_9mm_feeding_problemszi1dl.pdfIn PDF document text
    • http://walojafaj.iblogger.org/kawujesuveforirula.pdfIn PDF document text
    • http://xebiniseba.mygamesonline.org/duvivosanamojenefomi.pdfIn PDF document text
    • http://dokozem.iblogger.org/95577476282.pdfIn PDF document text
    • https://xoxopurotawasuj.weebly.com/uploads/1/3/4/6/134651309/wowusikivowaxonezipe.pdfIn PDF document text
    • http://helps-lnstagramcopyrights-about.com/650744353394ic29.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/ib_november_2018_exam_schedule.pdfIn PDF document text
    • http://fedezin.scienceontheweb.net/43132091893.pdfIn PDF document text
    • http://espaceabonnes.com/avast_free_offline_for_pcuohgi.pdfIn PDF document text
    • https://kibanelamuvudu.weebly.com/uploads/1/3/0/9/130969844/6312482.pdfIn PDF document text
    • https://sufosuzupunu.weebly.com/uploads/1/3/1/3/131379650/293d8d237.pdfIn PDF document text
    • http://a1metromovers.com/visual_thinking_strategies_artt528d.pdfIn PDF document text
    • http://nomevufaneboja.mypressonline.com/has_forrest_fenn_treasure_found.pdfIn PDF document text
    • https://kepiloxuxamife.weebly.com/uploads/1/3/0/7/130740378/petegejibeg_davuvidesudonu_silejebebim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kumasala/urea_formaldehyde_material_safety_data_sheet.pdfIn PDF document text
    • http://komiguzuvare.rf.gd/kupufazas.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/dotuxifubolamufo.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/72538751290.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e174c8bf-1573-4a7d-82aa-474727254001/3475472942.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/vakiritebon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71385819-73c0-4739-b015-251b7c3a625e/1064122985.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/061be158-89bb-46c2-b8d8-bedcd1b6b0c5/deep_sparse_rectifier_neural_networks_doi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4bbada3-6b44-426b-90d2-e643bed7d901/5th_grade_my_math_book_volume_2_answers.pdfIn PDF document text
    • http://lobinobunametiv.rf.gd/98196026289.pdfIn PDF document text
    • http://fuvarijes.atwebpages.com/29089254263.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_off00014786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14786 5576 bytes
SHA-256: ce1f3d25d559f0516b4acc69e2970ba7d75cb1bb4cf7a3e8698cb82094d127f9
font_01_sfnt_off00015a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A6A 10852 bytes
SHA-256: 987b1dd428ea262aecdd806166275e46a72ce2bc895a2342fd573a7be9036d06

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