Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecfdddfeea54a686…

MALICIOUS

PDF

76.1 KB Created: 2021-05-29 09:41:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 494ee2fd297f160ae4130bbeaa4de1a7 SHA-1: 119fd2ca112045dae76e98399239da05c7784acf SHA-256: ecfdddfeea54a686a244d145b1481ca469c46a204688b730636f7f3a8dbbe3c9
186 Risk Score

Malware Insights

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

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 0.9997

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
  • 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.
  • 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://ponafet.ru/strik?utm_term=icloud+unlock+%2526+hack+helper+v3+2+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369764/normal_604309fb33417.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496824/normal_5fe0fcbbc70e9.pdfIn PDF document text
    • https://vopilexazum.weebly.com/uploads/1/3/2/7/132740267/8864067.pdfIn PDF document text
    • https://sutopudebesi.weebly.com/uploads/1/3/1/4/131438093/8287735.pdfIn PDF document text
    • https://zilifanaj.weebly.com/uploads/1/3/4/4/134444715/bijijezil_mugixap_mefuji_pevajurexafeb.pdfIn PDF document text
    • https://rewodudifizaba.weebly.com/uploads/1/3/4/4/134475466/jufimotakoxiw-novanaganam-nijat-pefufomesapaju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416935/normal_602e5989e9a45.pdfIn PDF document text
    • https://xukusoresi.weebly.com/uploads/1/3/4/4/134488105/nebaxulogako_lilaveranijam.pdfIn PDF document text
    • https://pazixexawa.weebly.com/uploads/1/3/1/4/131437352/xefewufedutovem.pdfIn PDF document text
    • https://mevinabepoke.weebly.com/uploads/1/3/2/7/132740553/5945d7aab1.pdfIn PDF document text
    • https://kominuxopexazi.weebly.com/uploads/1/3/0/8/130814675/fc73cddd83.pdfIn PDF document text
    • https://vuxisiso.weebly.com/uploads/1/3/5/3/135321279/c6a3e.pdfIn PDF document text
    • https://koxamuru.weebly.com/uploads/1/3/4/8/134890845/7526336.pdfIn PDF document text
    • https://pejetoli.weebly.com/uploads/1/3/1/4/131454808/2283731.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421940/normal_6015899cf35a2.pdfIn PDF document text
    • https://walonani.weebly.com/uploads/1/3/4/3/134372970/duzosabuban_nijelexukanopig_pejov.pdfIn PDF document text
    • https://lurenejaxerugu.weebly.com/uploads/1/3/4/7/134728533/5616394.pdfIn PDF document text
    • https://dijafujuzu.weebly.com/uploads/1/3/4/3/134369935/2404095.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/5af65c78-4a74-47d4-a758-e83f1bc94db2/keurig_2.0_water_filter_replacement_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33616f28-f919-4261-888e-a7b900188707/is_2005_volvo_xc90_a_good_car.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4328b515-c689-4eb3-a200-3b3b1ea2f2d4/77535233739.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_off0000efb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB1 4452 bytes
SHA-256: 8763267a56d6fde410ccb356db7495ae402563d37ff61099a7e1ec1d083ce188
font_01_sfnt_off0000fee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE8 10788 bytes
SHA-256: 7fcb3204f05c66cbc5b9048a56cb9599958c26f4c9447127dfb0b9967183ef06