Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e13b13623a378c0…

MALICIOUS

PDF

84.0 KB Created: 2021-03-04 12:40:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b9a2b4a117ad603624bcf21966e2615a SHA-1: 5772830603ca1d43c2d6e0b58fbb0eb3918c6581 SHA-256: 8e13b13623a378c0691549dd50928cd18d459f9fe1af3699fbf685c8b5e558e2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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 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://pelibifir.ru/123?utm_term=hp+officejet+pro+8600+turn+off+sleep+mode PDF link annotation
    • https://cdn.sqhk.co/bapisolel/mI7jcqn/badewekomajeraredijav.pdfIn PDF document text
    • http://tiwimifozukimu.medianewsonline.com/51719258486.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423431/normal_60186dde31b5f.pdfIn PDF document text
    • http://luwogexejel.getenjoyment.net/square_d_well_pressure_switch_wiring_diagram.pdfIn PDF document text
    • http://xagelofitu.22web.org/maharaja_ganga_singh_university_phd_form.pdfIn PDF document text
    • https://mipapipav.weebly.com/uploads/1/3/4/0/134012398/8d967.pdfIn PDF document text
    • https://boxesagako.weebly.com/uploads/1/3/4/5/134589877/kizikowesomir_fevopedeneg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464871/normal_6033f01ab8a5b.pdfIn PDF document text
    • https://cdn.sqhk.co/ramidazumiko/gjvGzd7/jokagifesivodowiwexa.pdfIn PDF document text
    • https://jikizukudelo.weebly.com/uploads/1/3/4/8/134879768/4936366.pdfIn PDF document text
    • https://fanazogi.weebly.com/uploads/1/3/0/9/130969494/biwoxe-tafoze-xolifevudogi.pdfIn PDF document text
    • https://biwakegexenulu.weebly.com/uploads/1/3/4/4/134437141/tolebalugo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459321/normal_601dcb5c441e9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/vivunapuv.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/kpmg_bursary_application_form_2018.pdfIn PDF document text
    • http://fetavuxoze.epizy.com/ruvodijuvizizafatawix.pdfIn PDF document text
    • http://kuwixogup.rf.gd/azshara_guide_tank.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/gorofususaxorekegogi.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/how_much_oil_does_a_turkey_deep_fryer_take.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CF 5620 bytes
SHA-256: 432824657a2ac0d2e6a497073423b354c5db772ab9efaebd39df588417edda4a
font_01_sfnt_off00011ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE5 11084 bytes
SHA-256: e8bdb631683bcd5c2b0b5e4f6d52661e505f8d11b28b49472afb7f596fc0765a