Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecaec311ee4624b2…

MALICIOUS

PDF

72.2 KB Created: 2021-03-12 01:09:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb8ce5a7d705163be9c5426d7ee28509 SHA-1: 413819782544e46048048617b52fd26c0b4ed803 SHA-256: ecaec311ee4624b213c93a94b23a6f15c24216dfd0aa49de02a659b6e8f0b195
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple critical heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a mass external PDF link farm, with the primary redirector URL being `https://yafferge.ru/award?keyword=glicosideos+cardiotonicos+pdf`. The document body is heavily obfuscated, but the presence of numerous links suggests an attempt to direct users to malicious or phishing websites, likely for further payload delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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/award?keyword=glicosideos+cardiotonicos+pdf
    • http://yourbigdick.space/66846205312580sj.pdf
    • https://jabenawonidibe.weebly.com/uploads/1/3/5/3/135385032/6903857.pdf
    • http://manapuzasupin.sportsontheweb.net/citas_biblicas_poder_de_la_oracion.pdf
    • https://gusupaserilobe.weebly.com/uploads/1/3/5/3/135312632/lixawakuxapu.pdf
    • https://static.s123-cdn-static.com/uploads/4449627/normal_5fdec367e7708.pdf
    • https://static.s123-cdn-static.com/uploads/4456982/normal_5fe4c5b375198.pdf
    • http://lavogomibonit.iblogger.org/puffin_browser_pc.pdf
    • http://rowomonug.mywebcommunity.org/learn_english_through_story_advanced_level_6.pdf
    • http://groshyk.site/maserati_granturismo_sport_review_top_gear8euly.pdf
    • http://mamefumiwuto.mywebcommunity.org/dyson_v6_absolute_reviews_uk.pdf
    • https://nomibazet.weebly.com/uploads/1/3/1/4/131437462/xobuvega_wenureregux_saxizadov.pdf
    • http://wumijodurixemi.22web.org/devofapaxus.pdf
    • https://vefurubaturuxal.weebly.com/uploads/1/3/0/7/130739777/puzogosokebomip_wepopokumene_metuguroxo.pdf
    • http://fujigukatujewu.medianewsonline.com/57733462068.pdf
    • https://zefakibafiv.weebly.com/uploads/1/3/1/3/131383453/6d0050ab0.pdf
    • https://belujewirozem.weebly.com/uploads/1/3/2/6/132681559/566365f50a0faa.pdf
    • https://wisemawuperu.weebly.com/uploads/1/3/0/7/130738751/wojanuwemagilili.pdf
    • https://vekewofamir.weebly.com/uploads/1/3/4/1/134131384/5107606.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://duwopatovulid.rf.gd/islamic_dua_book_bangla_free_download.pdf
    • http://tesedep.rf.gd/health_and_safety_engineer_duties.pdf
    • http://jiwuboro.epizy.com/63267771293.pdf
    • http://tososite.onlinewebshop.net/majizifexeg.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb09.bin
4a017fa730ad2755a78b6770bace1e616060c76947dea38776783277dcad4144		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB09 5180 bytes
font_01_sfnt_off0000fcbd.bin
3d598a66462d555c38f96816ec6dcd864cedf95670fab285990ac05bc9ac62f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBD 10452 bytes

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