Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa4347592e5897f8…

MALICIOUS

PDF

98.7 KB Created: 2021-05-06 14:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e5fd629e1f6ddba26664551f62a96fbf SHA-1: 2e015134a9f7ad3b31b0ef7a8688da91cd9deb3d SHA-256: aa4347592e5897f8ff7fa5656303ea08db90a5de7761939ab5ae3f52719ba3de
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The presence of external URIs and the nature of the heuristics suggest the document is designed to redirect users to potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://ponafet.ru/strik?utm_term=what+is+programmed+death+ligand+1 PDF link annotation
    • https://zefowumuf.weebly.com/uploads/1/3/5/3/135327275/15a798.pdfIn PDF document text
    • https://cdn.sqhk.co/rixutixim/DibMgvW/69686743993.pdfIn PDF document text
    • https://cdn.sqhk.co/moxinivo/jbie1kU/tafaboruvebiki.pdfIn PDF document text
    • http://bebalezuve.medianewsonline.com/nonetazugasoje.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/rikalolosekapatapit.pdfIn PDF document text
    • http://bunagutafa.getenjoyment.net/cambridge_complete_pet.pdfIn PDF document text
    • https://jubibololir.weebly.com/uploads/1/3/2/8/132814038/d0e23374.pdfIn PDF document text
    • https://virefogagivagu.weebly.com/uploads/1/3/0/8/130815228/9230397.pdfIn PDF document text
    • http://xamawigokoke.mygamesonline.org/xisikununijesemupe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409103/normal_5fcb743ac0d55.pdfIn PDF document text
    • https://cdn.sqhk.co/kipaselofuza/XQiajgi/6218684382.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415742/normal_6041c415be0b1.pdfIn PDF document text
    • http://sogejovep.mypressonline.com/accounting_standard_12.pdfIn PDF document text
    • http://pakupuxojopef.getenjoyment.net/86933008403.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutowede/Lhfjfja/fixijejos.pdfIn PDF document text
    • https://gagakulusete.weebly.com/uploads/1/3/5/3/135326625/rosewijaj-mejifibenavo-ladevewipis.pdfIn PDF document text
    • http://rubolanir.mypressonline.com/millermatic_135_parts_diagram.pdfIn PDF document text
    • https://vurodotug.weebly.com/uploads/1/3/1/4/131454057/940fba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393189/normal_601fee69ce4b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378405/normal_6008effdab085.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a11dc84c-a2bd-464f-addd-72ea5d090cac/best_xbox_one_controller_charger_station.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d46011b4-aabe-4489-9bd2-83ca5d6f2fb3/the_secret_audiobook_free_download_mp3_in_tamil.pdfIn PDF document text
    • http://jozilaro.atwebpages.com/syngenta_alika.pdfIn PDF document text
    • http://wozitoso.atwebpages.com/vuvuveju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efc6729b-6114-470a-96bf-b87b710e6337/79170144347.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f8895c8-ef42-4f3f-9d4c-2210642b491b/how_to_get_my_cursor_back_on_lenovo.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_off0001426f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1426F 5440 bytes
SHA-256: db7c8a4431b7416f8cec7966b18c5dcf964fda18167b65d8c9cbd6c1108c26d7
font_01_sfnt_off000154ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154CE 12032 bytes
SHA-256: fb2e1791b25f04b9ddf67eb71380a20a9eac8ba75357f0b83f3eef74064acb24