Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e817ecd90f5380d…

MALICIOUS

PDF

71.1 KB Created: 2021-10-01 22:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b8bd8a4ea57d17796f4de6a28b19d706 SHA-1: 246c048ce07abd42d61457faf53dd2e998b4da71 SHA-256: 5e817ecd90f5380dd2947b7eb8d150861b2e68c372405df2a31fc8b36cc83520
174 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and ML classifiers. It contains embedded JavaScript and numerous external links, many of which are algorithmically generated and hosted on disposable domains, indicating a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the execution of malicious code or the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=the+walking+dead+season+10+episode+11+full+episode+free PDF link annotation
    • http://nzozkrowodrza.pl/uploads/editor/file/31560966358.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/nural.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/26225955579.pdfIn PDF document text
    • http://minhanh.com/files/45411231344.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/14760346029.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/57201964260.pdfIn PDF document text
    • https://slavicchurchmississauga.com/fck_upload/file/37336010027.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/lirupidomub.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ov4d46ckuq46cnt129hmu5foi7/79542495145.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/55720767100.pdfIn PDF document text
    • http://allier-genealogie.org/File:/vawefid.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/98566352560.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210905_202839.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/gobikajodiropow.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/bopef.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/53869899755.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/nobamefosomulizewaju.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/i6n3pp14ucbh6v28j0h2geco0d/32066619490.pdfIn PDF document text
    • http://aztkgb.love-mrt.com/upload/files/xilojibesitigo.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/junagurufukawilezimimam.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/zerutukasodorowibamuve.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/02/82050650004.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/38118361713.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/zinaniwavilefefodifaj.pdfIn PDF document text
    • http://normel.org/files/upload/file/kasapidurelubu.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/34647632320.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/67904900321.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/81964851535.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_off0000b46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB46B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC82 11092 bytes
SHA-256: 335471d7ab99729a802fc91cdae084fb6e40281c70621b6bc306118fba56beaf
font_02_sfnt_off0000e625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE625 15876 bytes
SHA-256: db8e86b29dcdce6e8d6db268cceed50620f2d7ade4e26c344d460fdd39459728

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