Malicious PDF — malware analysis report

Static analysis result for SHA-256 546310bf69a48725…

MALICIOUS

PDF

83.1 KB Created: 2021-09-12 15:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7afc5ba5ebc819473bcdd1b9ebcb13d0 SHA-1: e5d0c1fbc6941aac6ad8833e7736f3ddda719bf1 SHA-256: 546310bf69a48725a9c82f77014ddaf721f528cfd0f5387b86d4b122f3f078e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, many pointing to domains that appear to be part of a link farm, suggesting a phishing or scam lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically calls out the structure as a link farm on disposable hosting, reinforcing the phishing/scam nature.

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://inwebjor.ru/uplcv?utm_term=p2p+streaming+sites PDF link annotation
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/62ftch52s54svct5qlsfel84jg/76467182748.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/sipesakaru.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/novevemivinuxaxeruput.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/fevosogusaxisudakejoduz.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/51845778169.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/zebidamox.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/70939657661381a5125d54.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/31472676796.pdfIn PDF document text
    • http://pmke.cz/pictures/files/nokedosajojurixopile.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/95404856278.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/15920187668.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/gabowavixubizogejot.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/totokefalemag.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/15769576746133e4623a9a6.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/5687986279.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/witefexaxobawuxetor.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/50561117723.pdfIn PDF document text
    • http://armanetti.com/images/14452847996.pdfIn PDF document text
    • https://sanagustin.cl/files/xugoxusikazomopivi.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109091748395972.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/74752774592.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109090349539535.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/lorojujazubugawekenibe.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/50987395067.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9d69405a2---bokukimedipawafibe.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_off0000dff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF5 17820 bytes
SHA-256: 8fc6d1ad80d1db8a1d2bc60607702c2f8d5f8b7cf34eb718533b4b37ffc18647
font_01_sfnt_off00010e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12638 10552 bytes
SHA-256: 79d5e796bfa453aba47f3bc719271a0c8f7282b4962704e150c94df6958b73f7

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