Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c08426fc292b94b…

MALICIOUS

PDF

74.9 KB Created: 2021-09-13 02:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 72e6e40f6c932f23fd414fb4cbdc47d6 SHA-1: 015c9ceb324def37a59f709dea30fc7219d39dd2 SHA-256: 4c08426fc292b94ba12cd10a50c1926c138bf7062cf3d2ff877558ba24be2c5a
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 that point to disposable domains and link farms, suggesting an attempt to redirect users to malicious content or phishing sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate structure to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://queure.ru/uplcv?utm_term=the+hitman%27s+bodyguard+free+watch PDF link annotation
    • http://diskacme.dk/images/upload/file/rubikevotodadaruzojomuras.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/21300955845.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/zupapabufuwofixojomoxup.pdfIn PDF document text
    • http://lecostationery.com/files/file/nagefewitit.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d0dc2bd9c---39316978983.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/74955029462.pdfIn PDF document text
    • https://adikmanis.com/contents/files/ronujomedowunu.pdfIn PDF document text
    • http://gapp.fr/medias/files/35868702636.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/rolisemavinaduvixa.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/nitijemojinuziligonun.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/69472341407.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/topugejefawad.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/32235881546.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/79752968608.pdfIn PDF document text
    • http://prota.ru/upload/files/3379761454.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/67344642416.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/83576397588.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/zojupaburatosezuvigag.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/repifepukovo.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/jajuxaxowuvalo.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/43663119967.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/javupad.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/o46u377m7m2u85b1t9nep41ipm/gulaku.pdfIn PDF document text
    • https://csodamalom.hu/files/files/41318848265.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/75420638872.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/lonomakoweromowerib.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_off0000bed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED2 11316 bytes
SHA-256: b9b66e97d006e342c39e0ab8c64c4e41f8d0224dc013bf9106af1109cca5ec75
font_01_sfnt_off0000d92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92F 17168 bytes
SHA-256: c9b8d1d1ecb8a4cd8553c575541b9e390eb10b6750f80dbc9aa06d3f36cb31bc
font_02_sfnt_off0001055e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1