Malicious PDF — malware analysis report

Static analysis result for SHA-256 db81d100f5e29979…

MALICIOUS

PDF

70.4 KB Created: 2021-09-23 23:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 68e38b41725ff5bdb7af672ee1849864 SHA-1: d61f971d52763314ffb329e2bb2abd8f839f25dd SHA-256: db81d100f5e2997930d392b29ed1bda12bc50fba6956363f49a81c103243f8ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and the link farm heuristic indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://archism.ru/uplcv?utm_term=how+to+hack+wifi+password+using+rooted+android+phone PDF link annotation
    • http://aburobocon2019.mnb.mn/uploads/files/samifenofemuxebeluxugebi.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/59660275897.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/gilofeduzakojavozag.pdfIn PDF document text
    • https://hiroyoung.com/data/files/wegetokizegus.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/norevatibevilub.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/wewokosubuxegagimin.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/beseliriroxejan.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/13069420703.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/zikujoverejevixifesuru.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6b3af14c0---dopusapugapodotifub.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/33374729250.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210905170138.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/64051126436.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109030357458963.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/zajibovu.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/73105727537.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c8d8d2361a---ziridegeloledelozu.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/62939917693.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/rutekivafatelepawejuk.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/xulun.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/zaborozilikefotojulilumum.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/6213951568.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/99551740123.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_off0000b3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBE 15016 bytes
SHA-256: c8282d8db52c75ef1d9da9e417118f7a12b0c7ab31e00c2543744679314e445a
font_02_sfnt_off0000f1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B3 11124 bytes
SHA-256: 9fb979e3853c1c23697b4b4938d93ac9c14e5dd7aad5821eada94741af0195fa

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