Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc2bc9cc95a753c…

MALICIOUS

PDF

68.6 KB Created: 2021-09-30 13:37:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4074f143253dcb22a1ed567eb2d2a70c SHA-1: fa69d689fa3f1e78baf65ee4a26d8311223f5fc5 SHA-256: 5dc2bc9cc95a753c8e4b22d79c93677d488f04bba755a7e3fe08fe0dd302ba29
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. The embedded URLs and heuristic firings indicate it functions as a link farm, attempting to direct users to potentially malicious content under the guise of offering free premium apps. No scripts were extracted, but the overall structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://espacioschillout.es/images/admin/file/9556877493.pdf In PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16133c0640c11e---fikapedumidenad.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/60917067757.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/95578867255.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/89972962729.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/86110047692.pdfIn PDF document text
    • http://intertravel.hu/_user/file/kexixasebenaxuzeram.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/77770180002.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/bezorenowo.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/62274374310.pdfIn PDF document text
    • http://topoint.net/userfiles/fckFile/20210919032526.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/74161358595.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/jovasumimelewi.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/29351295308.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/mezepilonesejama.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210903_C48DE3DF593EF381.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/87626888494.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/78565430664.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/vozawikuboxapinin.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/95427741327.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/sutamikemajajejavi.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/nakuvovejofudif.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/1865453030.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+get+premium+apps+for+free+on+androidPDF 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_off0000aeab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEAB 10972 bytes
SHA-256: 0e926b6cf28988f71aea4718e35a23201505cef8df0f555b29aa234fb8ecb0c8
font_01_sfnt_off0000c7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F5 14572 bytes
SHA-256: dda686dc374534b0167d698bb02d1a98b2b78d3b6bb0f0c754f8efded88949b0
font_02_sfnt_off0000ec85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1