Malicious PDF — malware analysis report

Static analysis result for SHA-256 115bace64b1b62a3…

MALICIOUS

PDF

86.1 KB Created: 2021-03-18 23:58:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7a88315acc2c40f1a9d09fa876a9dcf SHA-1: 29615be753d07af0d012c863421e3b23c10cf427 SHA-256: 115bace64b1b62a3f4ebfef990185d2d8dc8751ff6363c908f665e4912160b09
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malicious intent. It contains a large number of external links, with one pointing to 'botokaw.ru', suggesting it's part of a link farm or phishing campaign. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs are indicative of malicious activity, likely aiming to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://botokaw.ru/wix?keyword=pearson+biology+chapter+2+study+guide
    • http://wewogokuwidu.mywebcommunity.org/muzawoxibisipuboxaxusop.pdf
    • http://zafikapasipugog.medianewsonline.com/7887947432.pdf
    • http://muzibatixabu.mypressonline.com/anonymize_comments.pdf
    • http://zijozarub.mygamesonline.org/pdf_pluralisme_agama.pdf
    • https://cdn.sqhk.co/puvubuzu/jjpidPi/3472195349.pdf
    • https://cdn.sqhk.co/suxepemup/giggePd/17669482515.pdf
    • https://cdn.sqhk.co/ribafesupuro/aBqoyXH/padivuxemetavula.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bisute/it_s_skin_collagen_mask_sheet.pdf
    • https://s3.amazonaws.com/tonemakopinibem/7469552430.pdf
    • https://s3.amazonaws.com/jirebonudur/4852577321.pdf
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_dc5521c5f9d34839abd843092a734e96.pdf?index=true
    • https://s3.amazonaws.com/gelawiweza/10449583496.pdf
    • https://s3.amazonaws.com/sigobija/airtel_tv_app_apk_for_android.pdf
    • https://6739ca04-605d-4ff4-b4c9-4e5bd75a7819.filesusr.com/ugd/031dda_47be71a299a34b3f82c5b14ddd75cd91.pdf?index=true
    • http://valupakukav.myartsonline.com/pioneer_vsx_522_subwoofer_setup.pdf
    • https://s3.amazonaws.com/fuwenoxuzasila/keberimupibudaboj.pdf
    • http://bumurulepowele.myartsonline.com/61155955709.pdf
    • https://33fe1336-4051-433c-b691-b763732126dd.filesusr.com/ugd/6c8f37_1ca39068949642cb9d6725c40a2e9e05.pdf?index=true
    • https://s3.amazonaws.com/gofiguj/57839122501.pdf
    • http://sutexuvidag.myartsonline.com/c_function_reference_pointer.pdf
    • https://s3.amazonaws.com/sitozi/watoxojawebonapasenotu.pdf
    • https://s3.amazonaws.com/debiwelof/tijizuwejidanirezoxanax.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_off0000fcf1.bin
e30e980b0b0e9ec68e1d87914c8f54a319c1ab94a71f0d4f2237ae971c83ba68
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF1 5712 bytes
font_01_sfnt_off00011062.bin
055d746a2cb50a04c8bb9d48defa1056127b40258fdf6cee0c416db36defa705
pdf-font-stream PDF embedded font (sfnt) at offset 0x11062 10724 bytes
font_02_sfnt_off00013541.bin
2732c78df68b4531e26da51a256f0f9ab881cb8a96d1886ade34872d88eeece3
pdf-font-stream PDF embedded font (sfnt) at offset 0x13541 16140 bytes