Malicious PDF — malware analysis report

Static analysis result for SHA-256 a948374d7e5d0aa5…

MALICIOUS

PDF

77.4 KB Created: 2021-04-04 22:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8392155d8b5e15928f51dce667c6952a SHA-1: 20581cead1faa8b2f8a5641b21da0fb2cbdeb79c SHA-256: a948374d7e5d0aa58b50ff264f0eb8cc0eacbb6467a337ee41b77d8a145d4b8d
126 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to a malicious site for credential harvesting or further payload delivery. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=course+2+chapter+1+ratios+and+proportional+reasoning+test+form+2b PDF link annotation
    • http://jonotijero.medianewsonline.com/49949722063.pdfIn PDF document text
    • http://olymp-trade.top/al_quran_bangla_filet9a4k.pdfIn PDF document text
    • https://tojewenegekov.weebly.com/uploads/1/3/4/5/134502344/sukegovodegoletup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375073/normal_600635fe9a3d5.pdfIn PDF document text
    • http://nelilovodik.scienceontheweb.net/nufufamozusuxomaloserekip.pdfIn PDF document text
    • http://tebeririz.scienceontheweb.net/niwomofemakew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416787/normal_5fdb40d3a8b48.pdfIn PDF document text
    • http://lukiduxipapep.mywebcommunity.org/27177418801.pdfIn PDF document text
    • http://texno3ua.com/harry_potter_the_illustrated_collection_books_1-3_boxed_set_hardcover__box_set_september_25_2018okbo2.pdfIn PDF document text
    • https://rasasagodum.weebly.com/uploads/1/3/2/3/132303335/rasagigi_tododekidatapu_zojem_fevaja.pdfIn PDF document text
    • http://unonatur.space/crochet_pattern_for_basic_hatuvobb.pdfIn PDF document text
    • https://gofadoden.weebly.com/uploads/1/3/4/6/134615513/kezusi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482860/normal_6015798ede2c1.pdfIn PDF document text
    • http://vijepuwobewi.mygamesonline.org/17031034433.pdfIn PDF document text
    • http://sezejawi.mypressonline.com/samples_of_formal_letter.pdfIn PDF document text
    • https://xanusikufugab.weebly.com/uploads/1/3/4/3/134371049/8cfc350.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/f6398230-f78f-4be1-9dc2-5b1fb4200bd1/wendys_jr_hamburger_sodium.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40e74d64-4ad5-43dd-b9bc-0400c6bf4d5e/whats_inside_the_burn_after_writing_book.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_off0000f0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F4 5796 bytes
SHA-256: 04e176ac0e44f61cf0a2467bcd3efb13740c7c19d851f47ba1c8e5ce7d68bb9a
font_01_sfnt_off0001048b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048B 10448 bytes
SHA-256: 85ebc34c848b4c1dd754c2270e7045c1d03ce7abb4922ac0cbbb60eb2203a0d5

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