Malicious PDF — malware analysis report

Static analysis result for SHA-256 979c5b3499dfeb3a…

MALICIOUS

PDF

74.4 KB Created: 2021-10-02 21:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 269de6504674a01c0be651cbb35259ea SHA-1: 56f1f210e6abbf30a59c2c58832cf9bc1fb719e6 SHA-256: 979c5b3499dfeb3a9aea0e4fff3f1a05da31c62ab488f676964bb11a42dedcfb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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=proshow+themes+free+download PDF link annotation
    • http://newshop.jp/archive/file/12422731722.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210904_BA00B09257085948.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/161447c0c7a709---woridozulikovoja.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/mukemejive.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/7583441109.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/95116830746.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/guguxubibetajut.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/33797259451.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161425995d1826---68286727928.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/tetunarugudodafasusumi.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/69244074590.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/72254527244.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/34038384389.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/12964039533.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210927_084821.pdfIn PDF document text
    • http://dd-eng.com/files/files/wotolavad.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/kudigepiboku.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/21095336237.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/siturubutaxipewo.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/91823245702.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/79839066723.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/93351230370.pdfIn PDF document text
    • https://salonrewards.ca/images/file/58675283500.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/gafukixefilolizarubeka.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/32221406862.pdfIn PDF document text
    • http://foodchemsino.com/d/files/87389941564.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/konanodemewugo.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/saruvonasavavikirudawules.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_off0000b76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB76D 10616 bytes
SHA-256: d23b84e530888e00fb1deb3e297369c04eac000ba555a056e8b68f95b6545ad8
font_01_sfnt_off0000cf9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9C 19744 bytes
SHA-256: 66438a6549d88e091a244cbe871be0cef597a08282faff8d4feed5d3a9190de7
font_02_sfnt_off000103a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1