Malicious PDF — malware analysis report

Static analysis result for SHA-256 d74ad2d0cee6c226…

MALICIOUS

PDF

74.6 KB Created: 2021-03-17 16:05:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d04a4b90b4eaea5a985d7d83c59f67ca SHA-1: e3e7c8e12f6eb8d620ba718cbefd23dd6fb55f51 SHA-256: d74ad2d0cee6c226ba0f53e1c1ac5a8456e02b4daa551b0ff7e1f6fdc488c612
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple external links, with one heuristic specifically identifying a 'mass external PDF link farm'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the PDF structure suggest an attempt to redirect users to malicious sites, potentially exploiting vulnerabilities for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/wix?keyword=divvy+up+socks+coupon+2020
    • https://cdn.sqhk.co/satofurijob/blbjgaX/blossom_blast_saga_mod_apk_2020.pdf
    • https://cdn.sqhk.co/libuzewis/iehdgeQ/wexorinafi.pdf
    • https://cdn.sqhk.co/niripakexad/j2pdjbd/nogesodes.pdf
    • http://dubulus.iblogger.org/horse_pedigree_template.pdf
    • https://cdn.sqhk.co/webepinovet/gQgdAgf/spell_defense_epic_bricks_breakers.pdf
    • https://cdn.sqhk.co/vatomepipiw/hdK8gf6/amc_car_model_kits.pdf
    • https://cdn.sqhk.co/pavoraxebute/Ljbsogj/buludulabotutasev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bikikifuxax.epizy.com/89746542757.pdf
    • https://s3.amazonaws.com/pasawe/jovolesigavogewagixotoli.pdf
    • https://s3.amazonaws.com/tufitijinexu/puwopadekawofarefodala.pdf
    • https://s3.amazonaws.com/bulikowexunepov/62730798579.pdf
    • https://s3.amazonaws.com/norozovijalu/cordelia_fine_delusions_of_gender_review.pdf
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_9e461b7db53245cdb673470b8f51e7fb.pdf?index=true
    • https://s3.amazonaws.com/remavuj/dotozigukogenadepe.pdf
    • https://s3.amazonaws.com/xojafemori/fonet.pdf
    • http://rotirokarovul.rf.gd/63278116610.pdf
    • https://s3.amazonaws.com/tazopaju/lifaxakagigimamojodu.pdf
    • https://s3.amazonaws.com/rexogeguxosix/56134783809.pdf
    • https://43a98339-0465-49d0-a416-8cef4780896f.filesusr.com/ugd/89258f_5b153b40fb484d0c85929454ec026af4.pdf?index=true
    • https://s3.amazonaws.com/numunenoji/tuwukesa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7bb.bin
7219ca0299f2c5368b52f30d1848093d28e1419df8aed31634448e14b63e9f1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BB 5088 bytes
font_01_sfnt_off0000f943.bin
a8ef53460283236bc7d265c6a3c2a1140a5d671c6d95ba4deca45ba69256693d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF943 10628 bytes

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