Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ca3b664414615cb…

MALICIOUS

PDF

81.6 KB Created: 2021-02-21 15:29:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc5564347aadd3bdea4a4f1fe6a6072b SHA-1: 4ed386ad4490f8801bb3d7ba4fb9907cf6365e03 SHA-256: 8ca3b664414615cb7c4e72207f3f8ac5ee3c09cf21e72d17f09a92919eed0dd0
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, forming a link farm, with the primary purpose appearing to be SEO manipulation or redirection to potentially malicious content. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest this is a phishing or redirection attempt.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/wix?keyword=hidden+city+mystery+of+shadows+hints
    • https://zewabezasakaru.weebly.com/uploads/1/3/4/5/134593707/4984670.pdf
    • https://wawodupalise.weebly.com/uploads/1/3/4/6/134621762/daduvewoso.pdf
    • http://kofagurosufo.22web.org/60338349006.pdf
    • http://zupuvotan.22web.org/87320489462.pdf
    • https://munuteme.weebly.com/uploads/1/3/4/8/134862418/rupiwizalinepax.pdf
    • https://nudusomezuriful.weebly.com/uploads/1/3/5/3/135387444/2760586.pdf
    • http://nebetejetagume.iblogger.org/distressed_debt_hedge_fund_performance.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wokesabisevo/teacher_s_guide_grade_11_general_mathematics.pdf
    • https://s3.amazonaws.com/minaxigevani/lawogovol.pdf
    • http://tizivedimusos.epizy.com/xotiwevamugasibesumoj.pdf
    • http://lufafutogixafu.rf.gd/charmeleon_silver_rg_movie.pdf
    • https://s3.amazonaws.com/fumiposamisur/archi-_lab_package.pdf
    • https://s3.amazonaws.com/werowibovezoje/kpi_template_for_hr.pdf
    • http://rojaxenutu.rf.gd/viginogizabo.pdf
    • https://s3.amazonaws.com/jajuzasalikirut/bt_chia_s_wifi_trn_android.pdf
    • https://s3.amazonaws.com/dudujopixejikug/witetuwox.pdf
    • https://s3.amazonaws.com/fenatagazise/4400577499.pdf
    • http://xafamikipu.epizy.com/octopus_apk_old_version_1._1._1.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_off0000ec0c.bin
b6ebfb85e50e07fa1e72163bbcd2429e61a1ad9555376ca062d96a727182be69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0C 5384 bytes
font_01_sfnt_off0000fe45.bin
ccc14bc133e68a20694bec14407c97f8aa16e8e79d45c49682e832cab5cc0e36		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE45 10960 bytes
font_02_sfnt_off0001240e.bin
bb4620ae2308066493f479cb0495314a41e91f5b0bfb2a754d9bad2ef34af03d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1240E 16060 bytes

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