Malicious PDF — malware analysis report

Static analysis result for SHA-256 36c8a81cb555fc48…

MALICIOUS

PDF

78.1 KB Created: 2021-02-26 11:40:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e5ae216fc7eec2ea1e92068e2e32796 SHA-1: e193346918b9ab38418fafa1f397da06ad01d680 SHA-256: 36c8a81cb555fc48d679918545a4fedabaed92f6aa935e7bcd2a2c6008c0c135
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm, suggesting an SEO spam or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=chocolate+miniature+dachshund+for+sale
    • http://useraisins.pro/software_engineer_architecture_interview_questionsksydb.pdf
    • http://podarokinsta24.online/fifa_world_cup_2019_live_streaming_channels5p4ic.pdf
    • https://cdn.sqhk.co/mogowepuw/igghis3/76190490502.pdf
    • https://cdn.sqhk.co/sovanoniwuva/UsghDje/continental_race_king_protection_26_x_2._2.pdf
    • https://cdn.sqhk.co/gobisurav/hgjbhih/daxake.pdf
    • https://vobajorod.weebly.com/uploads/1/3/1/4/131438629/a14fe.pdf
    • http://rosovutuwonemis.iblogger.org/circadian_rhythm_app_android.pdf
    • https://cdn.sqhk.co/linidivez/guebido/kenozesazejibulofifirob.pdf
    • https://gopoxigubujazu.weebly.com/uploads/1/3/0/9/130969754/sikexazage_nivovexalurepip_ligukuv.pdf
    • http://revilokepudidu.mygamesonline.org/sunijixuvugebavisa.pdf
    • http://replyua.site/the_game_1997_movie_download_in_hindi_720p0ogup.pdf
    • http://strongcreditscore.info/vixagusugiromubodopiliqrwtu.pdf
    • http://com-connexion.xyz/najuwewerafiwexumoxelmzgq.pdf
    • http://xariketixagat.mypressonline.com/canon_powershot_sx20_is_lenses.pdf
    • https://cdn.sqhk.co/noxisoture/hagDnJF/16048286044.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/kufazete/how_to_find_the_surface_area_of_a_square_prism_formula.pdf
    • http://jodafibo.epizy.com/94118996462.pdf
    • http://zowofiz.myartsonline.com/61528088793.pdf
    • https://s3.amazonaws.com/teximikamukubo/35720898991.pdf
    • http://sobogasitizi.epizy.com/hostelworld_amsterdam_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e434.bin
7f85cf04e4d791d92c2f7eb443c12973f742fb7566717a456b8958cc9218e210		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE434 5168 bytes
font_01_sfnt_off0000f593.bin
b65b4654b6cfdd692e99738a83f4bdcca043ac00bf17c594424afc2f6e6515ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF593 11528 bytes
font_02_sfnt_off00011ccb.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCB 4324 bytes

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