Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c1a0815bb140d9…

MALICIOUS

PDF

68.2 KB Created: 2021-03-04 11:12:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 936d479d32be379a24b227e2ba8f1860 SHA-1: 945ec75d23d5314971a7f1b269a38de88a2faaa5 SHA-256: a1c1a0815bb140d9794a2bfe780be3aeae486d988a1a81f49cd22cc633646a8b
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://golowaki.ru/award?keyword=perfect+english+grammar+past+simple+exercises+pdf PDF link annotation
    • http://pakisonuzaruwav.iblogger.org/best_free_excel_budget_template.pdfIn PDF document text
    • https://gawozigojuvapa.weebly.com/uploads/1/3/4/8/134896601/giwelukotunadak.pdfIn PDF document text
    • https://regifevadep.weebly.com/uploads/1/3/4/4/134476302/5ac7a38b27d.pdfIn PDF document text
    • https://subijiderekura.weebly.com/uploads/1/3/4/6/134616270/nosana-belijosun-wuluwudugab.pdfIn PDF document text
    • http://scotiaenlineape-personas.com/bizewalikexorm1ep6.pdfIn PDF document text
    • https://gitikaru.weebly.com/uploads/1/3/4/9/134901111/7783543.pdfIn PDF document text
    • https://jujowaganul.weebly.com/uploads/1/3/0/8/130874338/2171161.pdfIn PDF document text
    • http://rafupofamurawaf.mygamesonline.org/vinubapiwojimosarapuji.pdfIn PDF document text
    • https://buranujepexu.weebly.com/uploads/1/3/4/3/134339299/2696589.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sajomapujozokux.onlinewebshop.net/wazabikamag.pdfIn PDF document text
    • http://zajepatexesa.epizy.com/puvizo.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_off0000cfc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC8 5640 bytes
SHA-256: 52d7eb35de6cf2c3afc124b9450c30dc046f2dcbf00d0ed032ca333d0a75b7dd
font_01_sfnt_off0000e2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CD 9720 bytes
SHA-256: 556bae89442a6c58fd384f1528d07408672f8c2d784a8f9b6669ed2613aea152