Malicious PDF — malware analysis report

Static analysis result for SHA-256 181a5fadab201692…

MALICIOUS

PDF

82.2 KB Created: 2021-09-10 02:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0d3b71ceca62d97953dbf1b77d468154 SHA-1: 872d46ca7ff197b39fff9d5b0864fc5dbbdf04a2 SHA-256: 181a5fadab20169261c7dc620ca92bdfd8469fbd9f02fe06922964d5978bdad3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, suggesting an attempt to direct users to malicious content or downloads. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a high volume of links on distinct, potentially disposable hosts, reinforcing the phishing lure.

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://harmony.im/userfiles/file/91229307719.pdf In PDF document text
    • http://psycare-spb.com/userfiles/file/fidonijetofisonas.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/sazenufaxagadefopusep.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/tawilafonojapeberefe.pdfIn PDF document text
    • http://machulski.com/public/file/93755645493.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/18428545720.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/rusejolumidafovidawud.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/10404632779.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/satadisuviperaga.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/biwozedisep.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/34781197525.pdfIn PDF document text
    • http://vecsecity.info/editor_up/betobexezadupetunog.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161354d40a3232---puzibafikawukusifex.pdfIn PDF document text
    • http://aimic.com/userfiles/file/nelikutemugu.pdfIn PDF document text
    • http://bergepkolcsonzo.hu/userfiles/file/lomerimovose.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202197848285204.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/norigiwonigerusadotumom.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/37428834440.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/wovuxutoninojikaraf.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/pixujidotosozopa.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/32841763097.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/rolakuv.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/62079972332.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/95179089619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=lego+ninjago+shadow+of+ronin+apk+free+downloadPDF 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_off0000dbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D8 17528 bytes
SHA-256: ee5cacc1f90b5e30f329c08656d4913a4302552a379f3219edc07132ad0c54f9
font_02_sfnt_off00012173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12173 10944 bytes
SHA-256: 457940670225f81c8dec8af2c9d2b8bdcb7d67cc889f15e26b2347c3267a91d0

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