Malicious PDF — malware analysis report

Static analysis result for SHA-256 d555a2b7537cd46f…

MALICIOUS

PDF

77.1 KB Created: 2021-03-14 00:57:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: c98ad7dfdeca402ec156e78aeb3a5301 SHA-1: c17e22fccb6b4998c29eff8bfdd4e8cad5a4d635 SHA-256: d555a2b7537cd46feb89541bdd9811e853675f93b2f55b5164ef20e1a9bd10ab
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded URL `https://maypoin.ru/strik?utm_term=can+you+renew+your+bls+online` suggests a phishing or credential harvesting attempt, disguised as a service renewal. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` further supports the malicious nature by indicating the PDF is part of a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=can+you+renew+your+bls+online PDF link annotation
    • http://xevojifixifepi.scienceontheweb.net/anabolismo_heterotrofo.pdfIn PDF document text
    • https://polepufexiri.weebly.com/uploads/1/3/1/3/131379743/lokapinawa.pdfIn PDF document text
    • http://lenuvivureropi.scienceontheweb.net/garmin_vivofit_3_reset_after_battery_replacement.pdfIn PDF document text
    • http://bikelumonekodex.mygamesonline.org/poxumemorimoref.pdfIn PDF document text
    • http://tujemet.scienceontheweb.net/bodys_3_lines_of_defense_against_disease.pdfIn PDF document text
    • http://wejesigozolireb.getenjoyment.net/bunn_slush_machine_parts.pdfIn PDF document text
    • http://wojesukuzak.mygamesonline.org/lirob.pdfIn PDF document text
    • http://mokemowowove.mygamesonline.org/18635998358.pdfIn PDF document text
    • https://merirano.weebly.com/uploads/1/3/2/7/132710628/149429.pdfIn PDF document text
    • http://vitofemegawe.getenjoyment.net/11632799567.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/covid_test_delivery_jobs_liverpool.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_9d488f297bc543d189df01be505641d6.pdf?index=trueIn PDF document text
    • http://pajupevezujugut.atwebpages.com/family_portrait_drawing_easy.pdfIn PDF document text
    • https://b564fea6-732e-489f-a029-a72dc6590de2.filesusr.com/ugd/6a4619_c1aea85d494348189f5b2fee955feda9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xurixado/82670964322.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/bamboo_bed_sheets_edmonton.pdfIn PDF document text
    • http://niwimugosaz.onlinewebshop.net/60266939932.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_off0000f220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF220 4920 bytes
SHA-256: 8adb62b0380cc27e878283bd1945f267ab035fc1f4788d9b38c034cb10236594
font_01_sfnt_off000102fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FB 10584 bytes
SHA-256: 023159ee89ed583d4a32f828f8224dd8c285f80cc2536ec19a95b57d21ca1457