Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba88b6694695afc6…

MALICIOUS

PDF

71.6 KB Created: 2021-09-25 01:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 67775e2ffda8126364e440d9a2cec75d SHA-1: f1fe8aa065bb99d7c384de48f59ec67ab3f69e38 SHA-256: ba88b6694695afc6eb1f37ad62b083d5bb3eb5316b9ba91ee0ee5804942d2f6a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, one of which is explicitly identified as a disposable hosting link farm. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://epodhajska.eu/UserFiles/File/54587714287.pdf In PDF document text
    • http://kfbma.org/files/fck/file/guxubexoravajapitagusi.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/woputegabunadogaxuvu.pdfIn PDF document text
    • https://ripedesign.com/app/webroot/files/fckeditor/file/45751379327.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/30379805311.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/38538360710.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/tinudowogizomubor.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff1e5dc902---lupenelepuba.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/92780370325.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/kotupijilefazejixejo.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/99704778512.pdfIn PDF document text
    • http://dienhoabacninh.vn/webroot/img/files/sojifujun.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cd9c614a1---vuxomivipigibuva.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/lenuronosurokizivunabava.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/korazudazumib.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/17113947664.pdfIn PDF document text
    • https://laps.pl/userfiles/file/92596938897.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/gosedixigidiluwosegido.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/zawiziragurixujumapujoju.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/kisijegam.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/jizetulukobigiwomuxaju.pdfIn PDF document text
    • https://kawanmto.net/contents/files/75671683796.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/tibemumun.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/35255895220.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=dualshock+3+apkPDF link annotation
    • 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_off0000b56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB56E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD80 17188 bytes
SHA-256: 9faab740d656065bcf5664f6f8063743f8f6b82c68680ae8d8dc19f8dfd0178f
font_02_sfnt_off0000f941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF941 10308 bytes
SHA-256: 369154b4595bea701060043df53464c9aacc96760be7dd551e0cda3d57aa5dbe

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