Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1a2bce617751d60…

MALICIOUS

PDF

71.7 KB Created: 2021-09-27 06:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c7253c42f35911ac007b42ef837e47d1 SHA-1: c764d8f863f3d626bae445b407c72a9f7eaeea72 SHA-256: d1a2bce617751d600ed5e9e89fd5fc934c33f0898903d0f1f8320af8d90188d0
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution campaign. The PDF structure itself is also noted as a link farm, further supporting this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=introduccion+a+la+didactica+pdf PDF link annotation
    • https://autoteam.in/ckfinder/userfiles/files/lubaluzebubuwekowop.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/logodetibewopalagugixal.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/65354817331.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/14260684364.pdfIn PDF document text
    • https://micsys.in/userfiles/file/92395717285.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/dabigupigulekasuk.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/96111865538.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/wesakig.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/17450797224.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/4196384634.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/xigidumexofujewa.pdfIn PDF document text
    • http://santeh.md/img/files/vugit.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210926165825.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210905100235.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/japitijorinelijoridoledo.pdfIn PDF document text
    • http://samtle.net/ckupload/files/binawosafimififa.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021091912451173499.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/49091168074.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/zuzotuxirupiwokinavoj.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/nijuvojutamivegi.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/72820371253.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/denevoni.pdfIn PDF document text
    • http://langmypham.com/luutru/files/82368172695.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/85058047603.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/xezujeleg.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E1 16588 bytes
SHA-256: 18478f86286b03f614c39e5ff5d859e36fd4336941492beaedaba8899a533529
font_01_sfnt_off0000e15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15C 10364 bytes
SHA-256: 5ba3936be2a7b8cba70afc5af3b3817ad9c3c101b5888b71b056e32a70a80a2f
font_02_sfnt_off0000f8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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