Malicious PDF — malware analysis report

Static analysis result for SHA-256 622388f600654ca5…

MALICIOUS

PDF

83.9 KB Created: 2021-05-15 18:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f51bb9e7427a993ef1baf0e91c0edf72 SHA-1: 72353c81d2b4c7182dc69842c64a76cb5a91b2c8 SHA-256: 622388f600654ca5eb1f17dc18817374a19deec51f1b50670dbf71de4f8ef136
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=what+is+synonym+of+hit+violently PDF link annotation
    • https://cdn.sqhk.co/kilobubag/hhUhfjf/full_form_of_mitra.pdfIn PDF document text
    • https://cdn.sqhk.co/dedenijikal/TmIKhhh/esia_report.pdfIn PDF document text
    • https://cdn.sqhk.co/foropogajag/FWhijiJ/betty_crocker_chocolate_cake_bake_time.pdfIn PDF document text
    • https://cdn.sqhk.co/zugivakizo/qNjafjd/hocus_pocus_dani_actress.pdfIn PDF document text
    • https://cdn.sqhk.co/zafupusapun/TR3KvFG/fishing_break_mod_apk_4._0._4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471959/normal_6021ccb0328ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425784/normal_603846cbbf1ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368763/normal_6006ab12cb197.pdfIn PDF document text
    • http://rusolije.22web.org/luwevese.pdfIn PDF document text
    • https://cdn.sqhk.co/turovonunido/ibjhhgg/vobifonepilu.pdfIn PDF document text
    • https://cdn.sqhk.co/luwokiseg/jhqaQg7/giwudawalaxigibosij.pdfIn PDF document text
    • http://givupuxorow.iblogger.org/web_development_tutorial_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://042e50b4-45d0-4577-915a-c14d43ab21ad.filesusr.com/ugd/18f527_8cf268612d394c42871bea4f5610f2d0.pdf?index=trueIn PDF document text
    • https://969948a0-d7f7-4827-958e-a3856fee42d4.filesusr.com/ugd/9d40bc_4a041ac2a9c64ce287baa887a161fb86.pdf?index=trueIn PDF document text
    • https://deed868a-3c3f-4b0d-b3ae-f9ebe8a38c33.filesusr.com/ugd/95283b_fa62ce4420294623b7c4d78b52898837.pdf?index=trueIn PDF document text
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_ad99dfcdc7cb4ed29f69cf8f9ec0402b.pdf?index=trueIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_f14d49cee1b847a9a45799424aed632d.pdf?index=trueIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_78c048b8f97b43c9bd6d5b13d1f16eed.pdf?index=trueIn PDF document text
    • https://bea00909-aa88-4d38-ac88-e56db460b486.filesusr.com/ugd/923104_4a6f567e34f1451e839ce5a13de5d801.pdf?index=trueIn PDF document text
    • http://rurobudono.rf.gd/how_to_crochet_a_beanie_instructions.pdfIn PDF document text
    • http://newalutu.rf.gd/superdry_womens_size_guide_xl.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93C 4876 bytes
SHA-256: 5cd817a80d117cb2dd0b1e6853f578a1861c58ea16162815fe7f6b0a5f874003
font_01_sfnt_off0000f9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B2 11176 bytes
SHA-256: 9a7ca5ed186572e0c53e7b7d5cf97806cf4c81e4c17c6eb9d3c8a7bb75b48849
font_02_sfnt_off00011f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F81 16036 bytes
SHA-256: 9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940
font_03_sfnt_off000133ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133EA 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333