Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0932b18fdaf4bbe…

MALICIOUS

PDF

78.4 KB Created: 2021-09-19 13:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0ec888905ca9f12fd642e9cc4f87403b SHA-1: 7672d01b6adf14aca6407c9e0aef4576e3d53f4a SHA-256: d0932b18fdaf4bbe56c6c44335b6e18969cd8923ae2cf9302da89c775b27c84e
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The presence of embedded URLs and the link farm heuristic strongly indicate a phishing or content distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://moscow-vernisage.com/files/files/bozoribawapirisotitirizif.pdf In PDF document text
    • http://pekbdt.com/filespath/files/20210904160409.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/1248523557.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109090719232098.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/23875813686.pdfIn PDF document text
    • http://horvathortho.hu/tmp/82308543932.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/75183106798.pdfIn PDF document text
    • http://exim5.hu/_user/file/71349358212.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/kogobiwobugad.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/654560345.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/46840680207.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/vabuseke.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210908235316010232zi6bv.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021090508555273499.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16140e59f0719b---xazogugugunojinopemamog.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/52297121756.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/37972979717.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/78454940789.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/wilexejujaxivosuponofup.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1631787733.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613958f044ad4---47998039288.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/23288072469.pdfIn PDF document text
    • https://gulamanis.com/contents/files/vijogexen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=bnha+heroes+rising+eng+subPDF 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_off0000c174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC174 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD986 22396 bytes
SHA-256: e6cd31267b6f986021bc5293205b2943b82e7480cfc1650d814e2caf81c666d3
font_02_sfnt_off000113ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EF 10536 bytes
SHA-256: 05b0e6a894d9a42402e30ff9f300384bfba07c1ca8ded918971b7cb9d262d0fb

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