Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec7f45f3e83744dd…

MALICIOUS

PDF

84.9 KB Created: 2021-09-09 08:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: de2dbef09e867c8511db6f365a7aacc8 SHA-1: f5ec325a8ad4386250fe35a809b24ffdf0e85f22 SHA-256: ec7f45f3e83744dd52b16b22ca00573a1b3f4e9354758cb9ca6bdb8b8b3a70d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pistant.ru/uplcv?utm_term=how+to+export+android+phone+contacts+to+excel PDF link annotation
    • http://bagiez.com/userfiles/file/lutapofedexofizesi.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/19079382847.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/11574501467.pdfIn PDF document text
    • http://olguanaokulu.com/upload/file/72425373597.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/35928059056.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/15422129432.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/kawusukizitif.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/roxov.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/lefiwososidod.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/tafabovuduxa.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/lenolufuvo.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/72282118939.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/95058016629.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210904060531.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/zipoxalewepepakolivosur.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/rumimezibebada.pdfIn PDF document text
    • https://ismart99.net/upload/files/vozaxapoboxigu.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/livebekubezizixaluzaj.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/sozokizafoja.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/gugikamewezuzivi.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/puterujoniworivemasew.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/wotiboxi.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8ed568a8d---45411140052.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109062321446956.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/55729306609.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_off0000e726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE726 10792 bytes
SHA-256: e4df01e4fb656fce6786ce9055a7bde748f91360cf5434df07aca033eb3bd0b5
font_01_sfnt_off0000fff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11806 17620 bytes
SHA-256: 9a30eb772c51f405e731d69f2029c9940496f640be56a84c566b2c86fe1bb43b

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