Malicious PDF — malware analysis report

Static analysis result for SHA-256 783af2a9c10d4ae8…

MALICIOUS

PDF

79.0 KB Created: 2021-03-16 21:40:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3aad1c68aec3e73641d0ad7f49e8da73 SHA-1: a0246037cc3c6d054b55a41babaef9dd26de00c6 SHA-256: 783af2a9c10d4ae8edda22e41b76692045e905f31a29f71f19eb42991f9790ab
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of many external links points towards the document's primary function being to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/123?utm_term=economics+midterm+exam+answers
    • http://nawireg.22web.org/char_broil_performance_4_burner_replacement_parts.pdf
    • http://tiwimifozukimu.medianewsonline.com/how_to_pair_ps3_controller_with_pc.pdf
    • http://gosugas.getenjoyment.net/numbers_in_spanish_1_1000.pdf
    • https://nifiwaratobiwe.weebly.com/uploads/1/3/5/3/135346776/12b17b34d4c8.pdf
    • http://gobitujesan.scienceontheweb.net/52515079882.pdf
    • http://gadivawiw.sportsontheweb.net/zefes.pdf
    • https://gisonegeviwobi.weebly.com/uploads/1/3/1/3/131383673/warur_vinugewiw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1319512b-780f-4a6b-975c-84a95540d02d/73100871808.pdf
    • http://pulavoxojefu.rf.gd/46350052270.pdf
    • https://s3.amazonaws.com/pazatuv/gavuwalukokira.pdf
    • https://uploads.strikinglycdn.com/files/c855e70a-34f7-41bf-9118-87a5220527e6/xarevebinaw.pdf
    • https://s3.amazonaws.com/bovenotojitowe/how_to_clean_saeco_aroma_espresso_machine.pdf
    • http://mamesejo.epizy.com/2816157379.pdf
    • http://palelezugob.onlinewebshop.net/my_dyson_brush_is_not_spinning.pdf
    • http://dufapojemuju.epizy.com/osaka_municipal_subway_map.pdf
    • http://vutuzirowu.rf.gd/29035888221.pdf
    • http://fawogalupa.epizy.com/wetavefugiz.pdf
    • https://uploads.strikinglycdn.com/files/901c274a-6e0b-4366-bccd-be8df1b1a1d3/songs_of_innocence_and_experience_by_william_blake_text.pdf
    • http://dowirimidezifa.rf.gd/27851470616.pdf
    • https://s3.amazonaws.com/patotale/34892881585.pdf
    • http://moxozejoxolisuf.epizy.com/buzonoviso.pdf
    • https://s3.amazonaws.com/juzowilipi/57491296594.pdf
    • http://vupikefugogulup.epizy.com/gosipisikisepalajogisi.pdf
    • http://fevumuweli.rf.gd/levunulotuvogavi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f51e.bin
5d9dadc2138944cc05aaf03d56deed4e665e68845523275061bff35c69f3a521		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF51E 5172 bytes
font_01_sfnt_off000106b0.bin
b746319103d528f847e98ca4737979632b3e28d591e165f050d41bc85841200e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106B0 11240 bytes

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