Malicious PDF — malware analysis report

Static analysis result for SHA-256 272c3b42a85ca82a…

MALICIOUS

PDF

78.6 KB Created: 2021-04-20 09:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: da87b8dcd21e09ec25cd2d9da5da4b64 SHA-1: 587276651d389ae0012eca75e20640b9314c03a4 SHA-256: 272c3b42a85ca82ad94e77b81f119c8b5cf57c221db1e8609454b9960d0ab708
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://crophysi.ru/strik?utm_term=how+do+i+order+a+child+support+card PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366337/normal_60023e33a2bac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481154/normal_604b0ea564525.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488339/normal_5fd12a9911ae1.pdfIn PDF document text
    • https://bolumuratojepo.weebly.com/uploads/1/3/4/7/134749128/wizunokemuziw-darunabaje-xavejorij-towakupugeke.pdfIn PDF document text
    • https://wuvesemoni.weebly.com/uploads/1/3/4/3/134335409/2a5cef217.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458428/normal_600ca80d2cb82.pdfIn PDF document text
    • https://gawobomune.weebly.com/uploads/1/3/5/3/135317514/porebulaputupuseg.pdfIn PDF document text
    • http://reetodo.online/donivefugapavzvcw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420013/normal_5fe067e267ec7.pdfIn PDF document text
    • http://studytogether.fun/364772336426942o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424985/normal_5ffa62bcaaa68.pdfIn PDF document text
    • https://fanejutasoja.weebly.com/uploads/1/3/5/3/135399707/d48b146bebf55.pdfIn PDF document text
    • https://sarotokatot.weebly.com/uploads/1/3/2/6/132682281/lodiwimo_kuwurusejik_kobowebakemike_sibirep.pdfIn PDF document text
    • https://tajamopem.weebly.com/uploads/1/3/4/7/134745730/kefawitedebike.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367294/normal_60170094d7be9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369503/normal_6065f00c035dc.pdfIn PDF document text
    • http://goodshopsales.xyz/ti_nspire_cx_ii_t_cas_occasion23kjq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369190/normal_600523cbd83d3.pdfIn PDF document text
    • https://fuvepuzineg.weebly.com/uploads/1/3/4/4/134463404/godetike_nozuradudajuba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456379/normal_601b53c2e8706.pdfIn PDF document text
    • https://dapasubasawesol.weebly.com/uploads/1/3/4/3/134383907/36991523.pdfIn PDF document text
    • http://tekplafond.xyz/wigoretedugumunazebokopozs097t.pdfIn PDF document text
    • http://theandyhong.com/jawigolitagividowovavqir9.pdfIn PDF document text
    • https://lazarapo.weebly.com/uploads/1/3/4/5/134528324/5231062.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/9584558c-d3d9-4d39-9c2d-83f51a6b44c2/dell_latitude_e6410_memory_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37f26166-b053-4dd0-b775-83a31ffc97af/zarapegojuzege.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db45288f-4d8a-4b17-96b4-bc666dff84e5/easy_power_chord_guitar_songs_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51d4e8d4-316b-4136-b8ee-36e7c0d2b337/numis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa605d69-5e66-49e2-be18-260af8231384/poemas_en_lenguas_indigenas_cortos_y_su_traduccion.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_off0000f5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B1 5212 bytes
SHA-256: e9dd43b73f943df515e9cfacf6f78bfd7a2f8a42fe91d44ef1232a9f369b8274
font_01_sfnt_off00010774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10774 10396 bytes
SHA-256: 963d2f255fdbe31bc85f5c4218bdabb0867672d68300947b08866249dce16860