Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7fafc55cd01457c…

MALICIOUS

PDF

81.9 KB Created: 2021-02-20 20:31:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7e8ee970c2f444a3b39fab5333d73d35 SHA-1: 94595a38012f7cf0defabae0288ea849cb9e509c SHA-256: e7fafc55cd01457c4ee981453181df45797fcc33ec99b3811476e37a7946b0f2
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical 'PDF_SEO_LINK_FARM' rule, indicating a large number of external links. The ML classifier and ClamAV also identified it as malicious. The embedded URLs suggest a phishing or malicious redirection attempt, likely to distribute further malware or harvest credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://druttle.ru/strik?utm_term=what+is+the+rhetorical+mode+of+ethos PDF link annotation
    • https://mavezuwunokil.weebly.com/uploads/1/3/4/6/134627141/8225587.pdfIn PDF document text
    • http://semengergel.ru/ledesi3t0q3.pdfIn PDF document text
    • http://verefdliyvtorogo.xyz/xijagimevowusupamusighmol8.pdfIn PDF document text
    • http://arenaprobet.com/wofexozokalepy525.pdfIn PDF document text
    • http://rodina38.ru/30388792096xv5ji.pdfIn PDF document text
    • https://gozezitigaja.weebly.com/uploads/1/3/4/3/134340412/5ec2bfa.pdfIn PDF document text
    • https://kofivenemiwelew.weebly.com/uploads/1/3/1/3/131380814/b34d90c31.pdfIn PDF document text
    • http://axecheat9.xyz/12_steps_of_na_and_aacgoev.pdfIn PDF document text
    • http://astrology-personal.online/96969796198f2pq2.pdfIn PDF document text
    • https://roxobirunuj.weebly.com/uploads/1/3/4/0/134096027/simijinabisi-xizetawuzolego-lojir-xataxexat.pdfIn PDF document text
    • http://vinorama.fun/293404974285w2d2.pdfIn PDF document text
    • http://potenciy.xyz/el_milagro_mexicano_mapa_conceptualfie3u.pdfIn PDF document text
    • http://pubguckazan.com/yugioh_card_guide_link_monstersyrtiw.pdfIn PDF document text
    • http://lg-copyrightforms.com/larabibikegumor44vz1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/cdma_architecture.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/simple_performance_appraisal_form_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/irrigation_agronomy_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/67985124036.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/poe_3._3_lacerate_build_template.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/levimo.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/35486981612.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001035f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035F 5272 bytes
SHA-256: 66226f4e0819c071ff54b61229da109fc59670747a4ccb529189e1f7fb74520c
font_01_sfnt_off0001152f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152F 10808 bytes
SHA-256: f212f2fba04fbd48c8355131a4dcea56e848ab42cdf0e3ace510bce54ef2e6ae

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