Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc986ee51a56cbc8…

MALICIOUS

PDF

71.4 KB Created: 2021-09-25 09:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b7080ad7d9e062d8e15eec5249b8c089 SHA-1: a1b1c5e64997e63eb67f48095ff841874e03e35b SHA-256: bc986ee51a56cbc8a8e82f4a81ba136b3428b38367ab9c08868be38ea1c1f656
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were extracted, the structure and URL patterns suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://shiprapublication.com/uniformkontakt/userfiles/image/files/75818916470.pdf In PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/4817428992.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/1371275916.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/laxaxelomigexetiki.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/22335069546.pdfIn PDF document text
    • https://olterus.info/contents/files/69476684666.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/daponozabusawu.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/zarotilisuxuxifigalo.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe3a284f55---42895264858.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/973629598.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/73174345714.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/e7c07826af46511bc863f80d387098ad.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/36207914450.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/33839936432.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/gudabolineperet.pdfIn PDF document text
    • http://erago.cidees.com/uploads/files/78864273647.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/xareja.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/75060114647.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/2034965084.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/20588248527.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/16418744915.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/meretoboderotexo.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/62515488189.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210919220505241.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/0a5t1c19n7u7mvj6kdeqno3vk4/kogavilasekibuje.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/suniw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=d+gamer+mod+apk+downloadPDF 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_off0000b289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB289 10556 bytes
SHA-256: db7bc03f32ac8d8875fa300111081858a2c4a6353f053a7b1fb9a2ac107f914f
font_01_sfnt_off0000ca5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5F 17748 bytes
SHA-256: cec9a8c3c15121f3ac26a1bce08930a00721a2bb03e3d8ed4e7c111a9333351b
font_02_sfnt_off0000f82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1