Malicious PDF — malware analysis report

Static analysis result for SHA-256 17b52b1553205269…

MALICIOUS

PDF

66.3 KB Created: 2021-03-03 22:48:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e55177d178bf73050cbd53d32487c20a SHA-1: 9e9a985b930fb3c5400d01e7616ec8fe3a4c2818 SHA-256: 17b52b1553205269ba1f388b6ef5b49554f55a194395f27cdcd77e397c1354ff
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of numerous URLs and the nature of the PDF heuristics point towards a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/wix?keyword=klipsch+r-112sw+cherry
    • http://pimifawimonidij.mywebcommunity.org/samsung_printer_not_printing_multiple_copies.pdf
    • https://cdn.sqhk.co/gujowaxexag/N3TLihd/99846836905.pdf
    • https://static.s123-cdn-static.com/uploads/4402718/normal_5fe0d2aada76d.pdf
    • https://cdn-cms.f-static.net/uploads/4408858/normal_602c454502fed.pdf
    • https://cdn-cms.f-static.net/uploads/4450426/normal_602d2e7729962.pdf
    • http://xidufefonudug.sportsontheweb.net/38285955236.pdf
    • https://kazazurijufom.weebly.com/uploads/1/3/0/8/130814205/5e110.pdf
    • https://cdn-cms.f-static.net/uploads/4457577/normal_60311149a397e.pdf
    • https://cdn.sqhk.co/faroziwe/qjhjajc/survivor_prison_escape_mod_apk_download.pdf
    • https://junapeborizako.weebly.com/uploads/1/3/4/4/134443413/xigogukewokigex-tizixe-rufilinizip-befosonepofaju.pdf
    • https://static.s123-cdn-static.com/uploads/4448549/normal_5fed9662e7d95.pdf
    • https://cdn.sqhk.co/vizelupavew/e5LSOig/microsoft_advertising_account_id.pdf
    • https://cdn.sqhk.co/kufalavoxig/xhgijhf/big_rigs_for_sale_in_san_antonio_tx.pdf
    • https://cdn.sqhk.co/bafujifi/NrjcjiL/angie_s_list_categories.pdf
    • http://xejopegig.mypressonline.com/doropuwadilugatijekane.pdf
    • https://static.s123-cdn-static.com/uploads/4472788/normal_5fc7b1ebc1954.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c634.bin
48b85e5071eade7baf2826b8acb42fed787839fc889909119bfe48134ba354fb
pdf-font-stream PDF embedded font (sfnt) at offset 0xC634 5188 bytes
font_01_sfnt_off0000d800.bin
d063d92cf03587458b60ce952be78da253d377f4878ad8a8ed764ccdb1a0671c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD800 10728 bytes