Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f9ddfbf444f13b5…

MALICIOUS

PDF

74.0 KB Created: 2021-02-16 11:09:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 1c4f37ac74e5fb735b815b650ced4020 SHA-1: 2782ae67bd3d2b2df2fb038564b6bf2e9015b7ac SHA-256: 4f9ddfbf444f13b5593edf9301925446492dcdcf57998ef4f22deef21eb7af51
166 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, with one heuristic specifically flagging a PDF link to an algorithmically-generated URL on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs and the nature of the heuristics suggest this PDF is designed to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://leonvi.ru/strik?utm_term=tokyo+ghoul+re+wallpaper+1920x1080 PDF link annotation
    • http://xonubevobupok.iblogger.org/luxefisazamu.pdfIn PDF document text
    • https://deponoma.weebly.com/uploads/1/3/2/6/132696267/251066e3ab37.pdfIn PDF document text
    • http://detonic-official.website/sujuno9z2er.pdfIn PDF document text
    • http://vashmaster.info/32305091650vbc9i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373753/normal_60199f81e4adc.pdfIn PDF document text
    • http://womenita.fun/dragon_city_how_to_get_legendary_dragonxhh5h.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453551/normal_5ffaa77621fb0.pdfIn PDF document text
    • http://cardio-active.site/request_letter_format_in_marathi_languages6ylt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454301/normal_5feaf38d3a558.pdfIn PDF document text
    • https://viwukafum.weebly.com/uploads/1/3/0/7/130738591/4330877.pdfIn PDF document text
    • http://retys.fun/ignou_date_sheet_dec_2019_bca28iar.pdfIn PDF document text
    • http://wordsideget.top/faxikevogakugamajoxufabirbimqp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427282/normal_6022adb79942d.pdfIn PDF document text
    • http://esclick.pro/mufubizafekotufimuvsrki.pdfIn PDF document text
    • http://wgathering.org/68752589030r5jyj.pdfIn PDF document text
    • http://erogan24.website/vizorululudarinogapl9r7k.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lubesugoninop.epizy.com/67305373722.pdfIn PDF document text
    • http://jowesokawebape.epizy.com/installation_report_form.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD72 5852 bytes
SHA-256: c0d58fe045ae3a846b6456f94e6b5acdd8988a5298d8292604ee930dfa2b8840
font_01_sfnt_off0000e17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17B 10488 bytes
SHA-256: efaa56d38a1fe8cde7b17a85ab484d4c82996768bf2c45994cc4c391816b2bf6
font_02_sfnt_off00010570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10570 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073

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