Malicious PDF — malware analysis report

Static analysis result for SHA-256 e501231eea57f34b…

MALICIOUS

PDF

77.8 KB Created: 2021-06-03 22:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37c4b9b6daa50e616d4963b6e1974b71 SHA-1: 50873ebf24ca25d68183d88d94d3cd775b722787 SHA-256: e501231eea57f34b94185a082c83c20610b80eba244d089ac299bd672ac7e020
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

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://drafthe.ru/pbw?utm_term=mahabharat+kannada+title+song+mp3+320kbps+download+star+plus
    • https://rebifigu.weebly.com/uploads/1/3/4/6/134663288/fupozu.pdf
    • https://nabutamu.weebly.com/uploads/1/3/4/5/134525390/rikijutujo.pdf
    • https://sufunisukexe.weebly.com/uploads/1/3/1/3/131381546/5729906.pdf
    • https://majojolug.weebly.com/uploads/1/3/4/5/134595566/pokur.pdf
    • https://cdn-cms.f-static.net/uploads/4495050/normal_60432f6037bce.pdf
    • https://cdn-cms.f-static.net/uploads/4472753/normal_5fd182863cc75.pdf
    • https://static.s123-cdn-static.com/uploads/4495251/normal_5fcefc4c02b9c.pdf
    • https://nekitunanozot.weebly.com/uploads/1/3/5/3/135346928/ab36012b1.pdf
    • https://reninifovebomul.weebly.com/uploads/1/3/4/3/134361606/3e6254.pdf
    • https://ganarusi.weebly.com/uploads/1/3/4/1/134109047/lutibiwu_povulawe_peneso.pdf
    • https://cdn-cms.f-static.net/uploads/4421461/normal_603ba64eca49c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/de38ccd3-18d2-4f93-9922-68a6f35f508a/91219921315.pdf
    • https://uploads.strikinglycdn.com/files/aa4cd012-f23c-4903-895b-e652f0907bdc/xapudotawen.pdf
    • https://uploads.strikinglycdn.com/files/1d93b763-5543-43bc-93eb-7cc954833727/marvel_movies_in_order_before_avengers_endgame.pdf
    • https://uploads.strikinglycdn.com/files/1a964ea3-dbbd-4737-9c52-6faf01045fcd/formula_para_convertir_numeros_a_letras_en_excel_2010_espaol.pdf
    • https://uploads.strikinglycdn.com/files/f759f15b-0d79-41fb-8032-481e8392c4fb/what_is_a_high_concept_script.pdf
    • https://uploads.strikinglycdn.com/files/a0b43377-d48f-4d13-84f0-d28d55df3ab9/96910004567.pdf
    • https://uploads.strikinglycdn.com/files/c51cea57-7156-4085-81b9-4b21059a3368/77978561334.pdf
    • https://uploads.strikinglycdn.com/files/25893ed2-df08-4dba-b878-fb41b8600a61/los_tipos_de_sistemas_operativos_y_sus_caracteristicas.pdf
    • https://uploads.strikinglycdn.com/files/ebcbb32b-96f1-420f-bed4-8a61b2533b19/is_higher_leverage_ratio_better.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db26.bin
56db8c48bd8105e03fd860bc88452a069e7288204a2c0ab867c2b5d01768b5d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB26 6112 bytes
font_01_sfnt_off0000efe2.bin
b9ca0c211d1b24b363005360799e380325f53c813ef3f67b885d5bd144a178ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE2 10552 bytes
font_02_sfnt_off00011429.bin
f0a8b786da721c7415a59d91fbce3b20bbb98ea32e48857ac1ff22d53b00ec29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11429 16144 bytes

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