Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc0668fcddb4e2cb…

MALICIOUS

PDF

82.4 KB Created: 2021-09-11 21:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 59677cccb87f2d7106d241f4b0cf229b SHA-1: de49fc4fb8f7198c7aaa7ce228dc70522e7629b6 SHA-256: fc0668fcddb4e2cb30226429c85ce6ff689d59bdca717e72ad62774823d6dde7
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to link farms, suggesting a phishing or malware distribution scheme. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags the document's structure as a link farm on disposable hosting, reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://rajaketiga.com/contents/files/kibijelukotisusagabipo.pdf In PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/wazami.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/91131997702.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090405195673499.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/todudixixereletezowavebap.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/81130386475.pdfIn PDF document text
    • http://ap-qatar.com/userfiles/files/mumapugar.pdfIn PDF document text
    • http://secretinvitation.net/images/files/70109629594.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8b4b85fad---94573629271.pdfIn PDF document text
    • http://snsi.jp/image/news_file/43381814377.pdfIn PDF document text
    • http://terlickodds.cz/www/www/fckphotos/file/72829976350.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/muvagejuporirikekuv.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/nekoxeraradoxinegovav.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/neneto.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/kenesotalak.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210909030528.pdfIn PDF document text
    • http://adice-area.com/pictures/files/tanenaxozetovesivaxesoz.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/3cg7qtu2mk75n6ql6sk6g60rgu/nuputimogigewevoti.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210908105809.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/galotoberogutavukujeda.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/13544620156.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/65033456347.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/93057010076.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/55069004446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+get+robux+from+other+playersPDF link annotation
    • 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_off0000dd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0C 17220 bytes
SHA-256: 0d662c74fdd407f50a66e52d34f31da8331ea74fe515d0a1a5be9451bd43e6f8
font_01_sfnt_off000109a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A7 11144 bytes
SHA-256: 72d77108b8800da0f490a81e7bb6e28af167bff8ce332cd0fe9ad746b3e5e047
font_02_sfnt_off00012397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12397 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1