Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d03ee4b05825d3…

MALICIOUS

PDF

81.4 KB Created: 2021-03-18 11:38:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e65793b7ac635716837944ecd8c62e84 SHA-1: 449c8ba171729f34541824b4cd7d7dbfa0bf67f5 SHA-256: d8d03ee4b05825d37facc468e1cb8f84532431f5724369f113b919ebc11da8d3
194 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to disposable hosting, suggesting a link farm designed to distribute traffic to various malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://golowaki.ru/aws?utm_term=honda+mower+hrx217vka+reviews PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392873/normal_604e9dc94576a.pdfIn PDF document text
    • https://cdn.sqhk.co/vutowogipu/gjiedZ2/song_download_mp3_app_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407316/normal_5ffd47c9d9977.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423137/normal_6002c32684da6.pdfIn PDF document text
    • https://cdn.sqhk.co/sokulutesi/jjie3ge/81818565361.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505699/normal_602fea7c53250.pdfIn PDF document text
    • https://cdn.sqhk.co/wejewenu/xhd9ige/nfl_network_thursday_night_football_analysts.pdfIn PDF document text
    • https://dedaruxije.weebly.com/uploads/1/3/4/4/134455514/fejomezedetugene.pdfIn PDF document text
    • https://wopirizebopate.weebly.com/uploads/1/3/1/4/131452778/7710972.pdfIn PDF document text
    • https://diwifiburu.weebly.com/uploads/1/3/4/8/134871147/senip.pdfIn PDF document text
    • https://merejeweja.weebly.com/uploads/1/3/1/3/131381112/803d1a69590b0e4.pdfIn PDF document text
    • https://wezenazuzive.weebly.com/uploads/1/3/4/7/134764498/2887641.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vojowox.epizy.com/35641557034.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b679d90-1124-4f4d-8e2c-bf80e6aa2eb6/nijekinexopixanumejed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/435f4681-004f-45fe-9fdb-75b89bd977ea/4160531644.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55e05b12-5f6f-469d-a357-c60264781ab2/kolisigeketenos.pdfIn PDF document text
    • http://dazoxamawix.rf.gd/18418318798.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/130f756d-fac7-4347-9ec3-88118e745d91/5796816331.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d24d6d4-44a2-423a-96cf-3e1800e831ee/how_to_write_a_response_essay_to_a_reading.pdfIn PDF document text
    • http://witopovuketoj.epizy.com/apa_manual_6th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b450cc4f-75c3-47ca-96de-d78f2edf3374/45059778702.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_off0000fd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD35 5540 bytes
SHA-256: 02dca686be438351d227c3daf2f587f39f65da043f37f7f22c760ba47da25340
font_01_sfnt_off00010ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFE 11832 bytes
SHA-256: b08e6fac295c572acbe44af930336639cc54593193ed751e30a2c62dd4aa5078