Malicious PDF — malware analysis report

Static analysis result for SHA-256 2770ba86a6c87f4b…

MALICIOUS

PDF

90.9 KB Created: 2021-09-16 18:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ffd0efdd6fbf74725ace5a03216acf61 SHA-1: ce7f37b2e5b19bb60143bf4bb0db040c40eb6f49 SHA-256: 2770ba86a6c87f4bdf059db0bf3a036806afc52f7a763b86ec995ff76aee5a96
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are likely used for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags the sample as a link farm on disposable hosting, reinforcing the phishing/scam nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ketchas.ru/uplcv?utm_term=a+quiet+place+streaming+service PDF link annotation
    • http://datev.hu/ckfinder/userfiles/files/muxopuwamujegopobut.pdfIn PDF document text
    • http://stattus.com/assets/file/tetodin.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/36397003944.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/96849240286.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/13965781869.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/5433125049.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210911003453.pdfIn PDF document text
    • http://mmsmarin.com/imgimage/file/ritisorotudedokolipogewup.pdfIn PDF document text
    • http://etkenkalip.com/files/98813228747.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/tevezuxaxomuk.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/30746974592.pdfIn PDF document text
    • http://anpharma.net/upload/files/97071557396.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613581850366d---rewekinepopebozideleg.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/52766780132.pdfIn PDF document text
    • https://felicityokolo.com/file/45513506660.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/jivati.pdfIn PDF document text
    • http://chinahongji.com/d/files/julerijareweponezusofet.pdfIn PDF document text
    • http://carbontuning.ru/file/wenufikoverizamobo.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/rusolufitujuzuk.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/rexetikufejowufenimiki.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/40480002780.pdfIn PDF document text
    • http://cmtsport.com/pliki/fofujozam.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/rujamafu.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426541067ba---goposakutegalagexow.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_off0000fd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1A 10892 bytes
SHA-256: ff85d566e321004643ff79bb3b96d714ac85d9f04617acfb2ea879f6a5dc637d
font_01_sfnt_off00011606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11606 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E18 18152 bytes
SHA-256: 8c6e69926150a01c2cd2a6cbf6b8b887a786394a76fce841be05534b23505196

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