Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d844ec1f50ea0f…

MALICIOUS

PDF

82.4 KB Created: 2021-01-01 21:52:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 190af018b9270bf3adb5e72a6e9cd160 SHA-1: 4cf55fc44ce7e9de0e9c589c4b213f2ac09b9e8b SHA-256: 84d844ec1f50ea0f4c2914f545ec11eb5c18ccdd30d1529bef5adfbb50a0ccaa
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, which is characteristic of a link farm designed to obscure malicious activity. The presence of a URL with 'utm_term=download+find+friends+app+for+android' suggests a lure to download a potentially malicious application. The ML classifier and ClamAV detection strongly indicate malicious content, likely phishing or malware distribution.

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
  • 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://trafffi.ru/strik?utm_term=download+find+friends+app+for+android PDF link annotation
    • https://vomediwanuxorat.weebly.com/uploads/1/3/4/3/134327005/214823476a8d.pdfIn PDF document text
    • https://tevoletefe.weebly.com/uploads/1/3/1/6/131606261/b626c6c1139d.pdfIn PDF document text
    • https://povutepumik.weebly.com/uploads/1/3/2/7/132741486/lejegumonivixaro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403534/normal_5f936b1f55d39.pdfIn PDF document text
    • https://gekowodi.weebly.com/uploads/1/3/5/3/135321574/1770155.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465267/normal_5fdf39fc637e1.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/zopafawefoluvenuguv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416510/normal_5fe6b696be1f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376125/normal_5fa8aa7dd2cbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367275/normal_5f962d818fe46.pdfIn PDF document text
    • https://dajifavetesa.weebly.com/uploads/1/3/4/2/134234726/gerikedo-rogodemabek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/9c96fd4f-b280-4488-9974-85f9fe355ebe/marriage_certificate_template_translation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afe54ba7-a0b3-434e-b36e-acb31c931142/complemento_predicativo_del_soggetto_esempi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fe5f318-52be-4e9a-a9ff-ecbdc0521570/32506617918.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ee49fab-11ff-4bd6-97e5-1a9c72c11bd9/gusenoxaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2da7042e-bd7d-4aef-ab00-7a3c4b739194/87838503647.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b659bd7-f489-45a0-8dde-a83695b49d21/45497437029.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF787 4832 bytes
SHA-256: e6bdf3a9a87243816f904a2a08897fb4a951711b16bc38750465bc8078799918
font_01_sfnt_off00010809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10809 11408 bytes
SHA-256: 75932a9ab2d77609c23c29361bf582157089ea8fa53dca78053367b4857bd433
font_02_sfnt_off00012e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E63 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3