Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe34b4b10ebb85f…

MALICIOUS

PDF

81.1 KB Created: 2021-09-11 21:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fb85a7ae928423a47af3ebfaaf7d1d14 SHA-1: be1b9d1a894cc16a90dd742180748d0980a3c692 SHA-256: cbe34b4b10ebb85fad3d75cbff421354bf02e5864a4c843af24f91e0601fa9d7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are part of a link farm. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple unknown URLs suggests an attempt to redirect the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9863

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 http://dogomanhnghia.com/uploads/files/sifelawaxofenibami.pdf In PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/10887583719.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/taruxekujobadup.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/49789932150.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/kozeles.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/muduxol.pdfIn PDF document text
    • https://ecosolar-energy.com/piceditor/file/sexidaroberizowonezud.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-2/20210902041057450030.pdfIn PDF document text
    • http://abwessex.com/uploads/files/zasonuvujugudugupe.pdfIn PDF document text
    • https://rcot.org/userfiles/file/bonugerugafe.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/5534790277.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/46899252575.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/10601576479.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/mebilunetalenarijesadu.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/rasesusemisafefokusubad.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613af54d45a25---62390636588.pdfIn PDF document text
    • https://protraderin.com/userfiles/file/22706441262.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/ninebilevofubupib.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613262d2d343f---3167296028.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/kupakogejur.pdfIn PDF document text
    • https://kawanmto.info/contents/files/laxodajer.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/gerutenujotu.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/jaxiruzez.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/90241259629.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/galisexivofozuzedudasuzil.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/vekupenosagulelawadof.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/digimakime.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/lanitozonekim.pdfIn PDF document text
    • http://www.fotolia.com'&gtIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+save+outlook+calendar+as+pdfPDF link annotation
    • http://www.fotolia.comIn 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://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_off0000dadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADB 17840 bytes
SHA-256: 8f61f1f6a939aea631f721af1c2092b507080e983fa3392ba6a7d1c5420b3fcd
font_01_sfnt_off0001085c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085C 10856 bytes
SHA-256: ae84f1e8c958f3d2b45b8c109e9bba96de31fd142e0b1d644e6be02a9c3c40fe
font_02_sfnt_off0001219d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1