Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ed98c7b44037d6f…

MALICIOUS

PDF

76.0 KB Created: 2021-03-27 17:17:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a4f5f205d40d2e899d76ae2180e91965 SHA-1: 9a9c44226f23a021c1cf77544e3bb6d110b392ca SHA-256: 6ed98c7b44037d6f44063770398e542257fd13180ded7b7ff9a36c4fcf2467ab
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, containing numerous external links to other PDF files hosted on various domains, some of which are disposable. The presence of a high number of links and the use of disposable hosting suggest an attempt to manipulate search engine results or to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/123?utm_term=contemplate+definition+adverb PDF link annotation
    • http://wovugikanagak.scienceontheweb.net/tejifipepepavuxewexoto.pdfIn PDF document text
    • https://cdn.sqhk.co/fubafonu/hcifjan/86284498088.pdfIn PDF document text
    • https://cdn.sqhk.co/vawadawuleja/jXcIhcd/lagabanuvomo.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/dsL4Uje/36494897784.pdfIn PDF document text
    • https://cdn.sqhk.co/wametofenuwo/Wjb7N3z/toon_blast_free_life.pdfIn PDF document text
    • https://cdn.sqhk.co/saboxiwago/hp7kcjj/lords_online_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/nemoludajedu/t4jesZN/stachys_hummelo_pruning.pdfIn PDF document text
    • https://cdn.sqhk.co/zewuxumaro/bjghhgd/bootstrap_form_modal_template.pdfIn PDF document text
    • https://cdn.sqhk.co/kixobaza/h0jb2fb/zowumiwibewalizekugi.pdfIn PDF document text
    • http://xasowokudat.medianewsonline.com/45079274045.pdfIn PDF document text
    • https://cdn.sqhk.co/sojowidaz/ghghggs/pifajarejaxazukuvu.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://daduzafez.epizy.com/citrix_receiver_4._8_for_windows_8.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/how_to_reset_canon_speedlite_600ex-rt.pdfIn PDF document text
    • http://sabozet.epizy.com/select_multiple_sheets_in_tableau_dashboard.pdfIn PDF document text
    • http://kakapefetabol.rf.gd/tifirovupomepuwiketuja.pdfIn PDF document text
    • https://09d56968-2ae9-412d-ad86-e67dc63a1c23.filesusr.com/ugd/e8b91f_bf4d6e58568148e0b8a034f5f6405e25.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/27348225162.pdfIn PDF document text
    • https://0dea665b-aaaa-42f3-a52c-f86f0fd1efa2.filesusr.com/ugd/8b9728_af6bf56aaa1a4ef09437f59418137cae.pdf?index=trueIn PDF document text
    • http://lofadezowudekeg.epizy.com/zemed.pdfIn PDF document text
    • https://4e16d9da-0927-4957-8a4e-4544605d6055.filesusr.com/ugd/d7e550_30a31a9575724276a760a91af0c05d85.pdf?index=trueIn PDF document text
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_b2fbfd769b414e5faa8596b98215cca6.pdf?index=trueIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01C 5020 bytes
SHA-256: 5ba903101dc86a3f4f5be02c88beee49cda9de9efcdc168ce708fdb02835de52
font_01_sfnt_off0000f117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF117 10296 bytes
SHA-256: cf9fd222e3f4c2678fb7f83749d5852b54d786c54070d771fb9467b7d340664b
font_02_sfnt_off00011422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11422 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c