Malicious PDF — malware analysis report

Static analysis result for SHA-256 d66a8698a959b876…

MALICIOUS

PDF

79.5 KB Created: 2021-02-04 11:56:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8cc86979b1a7333b9551505e6dd9a0ad SHA-1: e83f880a2623ac839d85f9c216702a91f4d5cd34 SHA-256: d66a8698a959b8764f2b1fc89d587ccdc0b1c6841a2f8ac0b67c268b89844400
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which appear to be part of a link farm designed to distribute malicious content. The heuristic 'PDF_SEO_LINK_FARM' indicates a high volume of links, and the ClamAV detection confirms the malicious nature of the file. The embedded URLs suggest a phishing or content-distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jacksth.ru/123?utm_term=declaration+of+certification+of+minority+status PDF link annotation
    • https://cdn.sqhk.co/nobixapo/ighdhdC/city_racing_3d_2017_mod_apk_rexdl.pdfIn PDF document text
    • https://cdn.sqhk.co/jogibigeda/ii0vib5/heartstrings_meaning_in_tamil.pdfIn PDF document text
    • http://kezivinu.iblogger.org/cambridge_3_reading_test_3_answer_key.pdfIn PDF document text
    • https://cdn.sqhk.co/pusuvizodez/jbgijjk/neha_kakkar_punjabi_song_new_video.pdfIn PDF document text
    • https://nusuxoxoli.weebly.com/uploads/1/3/2/7/132710665/kulosamebesek-zexanokuxagawa.pdfIn PDF document text
    • https://cdn.sqhk.co/zuzonoviza/exgiujg/i_wish_you_love_nat_king_cole.pdfIn PDF document text
    • https://cdn.sqhk.co/jefutubup/LKjdgdi/red_boy_pizza_fairfax_coupons.pdfIn PDF document text
    • http://front-glass.website/684516518127q857.pdfIn PDF document text
    • https://cdn.sqhk.co/lejesapazud/69hlSKI/gunedugunexuv.pdfIn PDF document text
    • https://cdn.sqhk.co/padixemugex/hzhejgH/zaxafo.pdfIn PDF document text
    • http://bubiwikozexamo.iblogger.org/hierarchicaldatatemplate_selected_item.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
    • http://xenemusexo.epizy.com/68336329852.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/fesuxudiwalulasavonurik.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/xitafuvudig.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B0 5008 bytes
SHA-256: bc59cb401543343799b602c3792aa465163450b6a66549c67870f994823f42e2
font_01_sfnt_off0000faa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA7 11172 bytes
SHA-256: 4186e7eda63e557286b2824ce7bd0c13ed15ba5e39ab52f503a52da1e2771978
font_02_sfnt_off000120b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B4 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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