Malicious PDF — malware analysis report

Static analysis result for SHA-256 288bb94a0920a269…

MALICIOUS

PDF

73.2 KB Created: 2021-09-16 01:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2b5a6e5ee30604d9783efaec2e8646b4 SHA-1: d1eb42bdf3ec3fb3d24840552facbefece0ac96e SHA-256: 288bb94a0920a269c90d453763eeda63c181dad128c91cff743cf8e740e9dd8e
166 Risk Score

Malware Insights

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

The PDF contains multiple external links, with several heuristics flagging it as a link farm on disposable hosting and pointing to algorithmically-generated URLs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and numerous external URLs suggest it's used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://irlanc.ru/uplcv?utm_term=all+android+flash+tool PDF link annotation
    • http://asia-test.informacittadino.net/media/files/2716981655.pdfIn PDF document text
    • https://ismart99.net/upload/files/57841875125.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/nixezegevitazijovoniko.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/85666961869.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/28314586356.pdfIn PDF document text
    • http://kaies.net/upfiles/file/bikenarapuredutiguze.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/gedomupugatajajufepifimo.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/69289914312.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/54747366451.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/legake.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/49777927411.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210906012445.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/bofapa.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/59703725115.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/23495548805.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/jeziwevawetekojasax.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/jewawakofapala.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/16568207416.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/e76651a5facbff44910cb17a709f87ad/minabudurirusajawapovoz.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210902_28B5DF707E3CFF10.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/tuzepozurilalax.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/dulunolifipotilibazib.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/42882551455.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/53749968587.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_off0000beb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB5 16352 bytes
SHA-256: cb72441ef80f03aae6a42e6a98fd0fbb5964c151bb2360e9ba6a2ffb7c074197
font_01_sfnt_off0000e882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE882 10300 bytes
SHA-256: 2074517491b661c4ca526bb15894d9f90b79f884dd2e9d0133d7bc53918e982d
font_02_sfnt_off0000ff97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1