Malicious PDF — malware analysis report

Static analysis result for SHA-256 46733bf0a39ecba9…

MALICIOUS

PDF

86.6 KB Created: 2021-04-06 06:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d168baef7ccfd907583ead647cb277b SHA-1: cdde86974115ddfa7e81a62ba4d3d7acba9d7f9f SHA-256: 46733bf0a39ecba92be9aef42adfa213f75fe97b4b6b71f1bde3b22781c39f7f
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link disguised as a medical textbook, which is a common lure for phishing attacks. This link redirects to known malicious infrastructure, indicating an attempt to compromise the user. The ClamAV detection and ML classifier further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://yafferge.ru/123?utm_term=cecil+textbook+of+medicine+22nd+edition+pdf
    • https://static.s123-cdn-static.com/uploads/4389601/normal_5ff617c48ad07.pdf
    • https://static.s123-cdn-static.com/uploads/4370541/normal_5ff5c3637784d.pdf
    • https://cdn-cms.f-static.net/uploads/4402517/normal_600a5b1525752.pdf
    • https://static.s123-cdn-static.com/uploads/4423696/normal_6001ee6941d59.pdf
    • http://talebakela.iblogger.org/45096349470.pdf
    • https://cdn-cms.f-static.net/uploads/4447465/normal_600b6eace3b04.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_08545572482047ddbeb37217e7e21cde.pdf?index=true
    • https://ab9101c8-a046-40a0-ba79-761bab9f3367.filesusr.com/ugd/61fb7c_1ef92bef92d2400199bf882db813023c.pdf?index=true
    • https://c534e673-b245-4a6d-8787-855fe96db707.filesusr.com/ugd/e19215_086eeafa24644c8eb9c52f6294aaab21.pdf?index=true
    • https://s3.amazonaws.com/wutezigojuxi/29448790952.pdf
    • https://9c3086b9-336b-4a4d-b39c-975a2563a2e0.filesusr.com/ugd/f4f792_edb6e02846334267af4bd5cdb77cfa24.pdf?index=true
    • http://bevojekibawe.rf.gd/ejemplos_de_notacion_cientifica_suma_resta_multiplicacion_y_division.pdf
    • https://4fbc56e1-d9a2-4996-be1d-38f9cd263936.filesusr.com/ugd/b1afee_47af7eb9afd9407cb982354295d984f0.pdf?index=true
    • https://s3.amazonaws.com/mikibetiv/design_thinking_guide_book.pdf
    • https://69669160-cc20-42a3-bfef-e1e1fd1f8163.filesusr.com/ugd/8094a4_ce3956cc24e84cb3bc82d88b0bc5ef7d.pdf?index=true
    • https://s3.amazonaws.com/wefadep/24834647197.pdf
    • https://s3.amazonaws.com/sobaketemu/13708979652.pdf
    • http://jexovisejaj.epizy.com/aiag_apqp_manual_5th_edition.pdf
    • https://s3.amazonaws.com/pogolo/pathfinder_summoner_guide.pdf
    • https://s3.amazonaws.com/divexikav/golfbuddy_golfbuddy_aim_w10_smart_golf_gps_watch.pdf
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_fa05f9c377ea4343af971fc945142759.pdf?index=true
    • http://wigelasipop.rf.gd/26552979624.pdf
    • http://jisexapegumet.rf.gd/21902564075.pdf
    • https://78ee58ad-4251-4cb6-9d9e-6f806931ac90.filesusr.com/ugd/b6b4e8_ab00e02d8e0e4b33a836ce691203589d.pdf?index=true
    • https://s3.amazonaws.com/zesotat/xeresewisetat.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_off00011429.bin
df9ab015dd7dd5e2dd85f33a21e53e635f291ef093f06e32d032fd47a1d781f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11429 5124 bytes
font_01_sfnt_off00012590.bin
d7c811b110cccfd693c41d609abde66b909acb7fe120591b071f429856d65d84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12590 11544 bytes

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