Malicious PDF — malware analysis report

Static analysis result for SHA-256 351af818ef8d029d…

MALICIOUS

PDF

70.2 KB Created: 2021-01-06 14:19:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: fe450632058ab828fb547f9f657a98b9 SHA-1: 79fab280ded677c9b7e16c3e83562e064dd98a51 SHA-256: 351af818ef8d029d263729bbad199b0f8c5e5523550e5ea2270a617b3c57e28e
214 Risk Score

Malware Insights

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

The PDF contains a link farm and a direct link to known malicious redirector infrastructure, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/aws?utm_term=limiting+reagent+worksheet+answer+key+with+work In PDF document text
    • https://jarofipe.weebly.com/uploads/1/3/1/4/131408229/wakekaxo_tojex_tedinawusixip_bavamumatiju.pdfIn PDF document text
    • https://tapidokebijimub.weebly.com/uploads/1/3/4/5/134577153/2062498.pdfIn PDF document text
    • https://kozewofedira.weebly.com/uploads/1/3/4/8/134899359/kolaroti_selabe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368221/normal_5fcba04e30d82.pdfIn PDF document text
    • https://kitabenulo.weebly.com/uploads/1/3/0/9/130969432/golowos_newopetivol.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/07f7d3a3-ba16-40c5-a6c0-dd2cb6417d09/13236208593.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/73589875759.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/brave_movie_moviescounter.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/sojojexagedalixomeruxoxu.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/geguzevaxenovedufido.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/yankees_stadium_seating_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dacc70d-344a-4a4b-a560-c522d537db0a/vision_fitness_t9200_belt_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8eeda84-097c-4166-8058-c61dac63d005/tasalovafuw.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_off0000d585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD585 5264 bytes
SHA-256: 21fe993c2a3c6b1f372a6a0f91ac84fa8cbb8dcf8216cab9c2bcc64eee5a6129
font_01_sfnt_off0000e75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75F 10584 bytes
SHA-256: e87086402fd00eae79bc498d01ff678e7f006881a49dbc15b166a211b71be4e0

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