Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d1ac748eeb3611…

MALICIOUS

PDF

68.5 KB Created: 2021-09-29 12:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f0d92cb1de01b12fb38f7b9e2fbeb49 SHA-1: 3a2c68628624068a96a91cf076fce277213ed230 SHA-256: a7d1ac748eeb3611bedb214f14855c88351e876e6eb571cae25f82be4de7afec
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical for phishing campaigns, with multiple embedded URLs pointing to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure and embedded URIs suggest it's part of a link farm designed to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://laborke.ru/uplcv?utm_term=where+are+downloaded+pdf+files+saved+on+android
    • http://urs-certification.com/gais/image/file/31775345090.pdf
    • http://mycoapaisyl.com/webimages/files/mituxudisaza.pdf
    • http://e-hematologica.com/users/file/suwubawadofavafenurofibox.pdf
    • http://beastyenergy.com/userfiles/file/37946069193.pdf
    • https://atlaskvartir.ua/data/uploads/files/91853378611.pdf
    • https://bdblue.com/ckfinder/userfiles/files/52670314388.pdf
    • https://forssah.co/userfiles/file/vamonemugubebififotivad.pdf
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1631485420.pdf
    • http://chelseafoodmart.com/uploads/files/11699421861.pdf
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/bebabaxofol.pdf
    • http://olgapolyakova.com/files/files/gonufominarodejezevasu.pdf
    • http://saikunghouse.hk/userfiles/vomabok.pdf
    • http://140.121.161.111/ckfinder/userfiles/files/34480022859.pdf
    • http://interreg-ipa-husrb.com/downloads/55514818038.pdf
    • http://zagazzo.com/userfiles/file/tiwozomevogezibevamenijox.pdf
    • https://rh-h1tapi-turbo.com/contents/files/pavonoseviraj.pdf
    • http://modern-pro.ru/files/file/werazewavar.pdf
    • http://modamoda.nl/uploads/pic_lib/file/komibexedomobipepa.pdf
    • http://ccshecea.org/upload/files/bavan.pdf
    • https://www.agencesramos.com/ckfinder/userfiles/files/5636995998.pdf
    • https://pilot-nav.com/ckfinder/userfiles/files/52980042616.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161538a321d828---gigajomejawopusu.pdf
    • http://yogaschoolofkerala.com/photos/editor/files/61438434897.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613da6f3f16f5---96017721645.pdf
    • https://planet-pvc.com/upload/files/62135590617.pdf
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/lezexanilumusawuwa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b15a.bin
dd02422ecd7f6f32bf641bb90eebd9de84addbe215e3b1ae0d339d77673929ef
pdf-font-stream PDF embedded font (sfnt) at offset 0xB15A 13924 bytes
font_01_sfnt_off0000d3c7.bin
87bdb8f10e613408050408c9e116087096f4da6f107b30b5ea10be3b51bf0d26
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C7 10640 bytes
font_02_sfnt_off0000ec0c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0C 16792 bytes