Malicious PDF — malware analysis report

Static analysis result for SHA-256 e039ef8e29c6a8eb…

MALICIOUS

PDF

88.8 KB Created: 2021-03-24 09:28:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7cd76459ba2409466e6618435f5c4d5d SHA-1: 48eb46eb9144329cae053322f9b0cf692e9e01f4 SHA-256: e039ef8e29c6a8eb586859fa400af3b284e64a7405563fa325eb1e29d8e28a0d
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external websites, identified as a link farm and a malicious redirector. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or SEO spam campaigns. Although no scripts were explicitly extracted, the PDF structure itself facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://yafferge.ru/123?utm_term=total+war+warhammer+ii+dwarf+guide
    • http://ooovseanalizi.ru/how_to_apply_vinyl_decals_on_a_carrg2fo.pdf
    • http://the-glow.ru/conical_pendulum_experimentxb6b0.pdf
    • http://trysucre.pro/what_are_the_five_stages_of_team_development_in_healthcaret2xso.pdf
    • https://cdn-cms.f-static.net/uploads/4405206/normal_6015e5bd14d8b.pdf
    • https://static.s123-cdn-static.com/uploads/4387562/normal_5fcd3efee865b.pdf
    • http://maykistore.ru/77303497538h34k4.pdf
    • https://cdn-cms.f-static.net/uploads/4447466/normal_60464983964ab.pdf
    • https://static.s123-cdn-static.com/uploads/4452400/normal_5ff3e661ae2bd.pdf
    • https://cdn-cms.f-static.net/uploads/4383913/normal_601e722d55fd0.pdf
    • http://bigno.space/gtx_970_vs_rx_580_benchmarko1yh2.pdf
    • http://ehaberdevlet.com/wifota9i0n9.pdf
    • https://cdn-cms.f-static.net/uploads/4383688/normal_60392686f2c66.pdf
    • http://chelamela.org/que_es_abrogar_y_derogarhbc9b.pdf
    • https://faripolugariwel.weebly.com/uploads/1/3/1/4/131453512/a6a15cf1b3d5.pdf
    • https://cdn-cms.f-static.net/uploads/4409619/normal_603c4bd22569f.pdf
    • https://cdn-cms.f-static.net/uploads/4470678/normal_600a5af35f866.pdf
    • https://ruvudiroxutorag.weebly.com/uploads/1/3/0/7/130775702/39fa1.pdf
    • https://sefubokadizafa.weebly.com/uploads/1/3/4/8/134880044/sivenubutotemuxaw.pdf
    • http://it50off.pro/stinging_red_rash_on_legsxmrvj.pdf
    • https://cdn-cms.f-static.net/uploads/4406208/normal_6048a5a922967.pdf
    • https://nupuwumot.weebly.com/uploads/1/3/5/3/135305030/6697856.pdf
    • http://fruit-italy.space/zozusuwolinekanega7v7mz.pdf
    • http://ufenmac.com/activate_b2_student_s_book4ek2z.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_off00011f13.bin
bbfd9c999aa9e585eb9659c083f3cf92f421b8ae2917a9f1721304c1327b5276		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F13 5184 bytes
font_01_sfnt_off0001309e.bin
66e92107c1cd74eb16df07e3d01371f16ac27123f9cb10f61470b0bb2dcba6f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1309E 10980 bytes

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