Malicious PDF — malware analysis report

Static analysis result for SHA-256 5888dff48d52aca8…

MALICIOUS

PDF

80.8 KB Created: 2021-04-06 01:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d75ef32d8d904c9ed55dc63fe508929c SHA-1: 36a763b64c2eca7242c2836b452e7f3974a4b204 SHA-256: 5888dff48d52aca8aa018f02beaa152663248ea9f008002373f2414976e5acc0
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a PDF link farm heuristic suggests the document's primary purpose is to redirect users to external URLs, potentially for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and external links are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://kuzutuzo.ru/aws?utm_term=paige+bueckers+high+school+points PDF link annotation
    • https://taxurazuzar.weebly.com/uploads/1/3/4/0/134042721/4441420.pdfIn PDF document text
    • https://retelajipubo.weebly.com/uploads/1/3/4/7/134700068/vasaxeb_fajet_xodax_rifazux.pdfIn PDF document text
    • https://megojame.weebly.com/uploads/1/3/5/9/135992505/pawirutixo.pdfIn PDF document text
    • https://cdn.sqhk.co/tuvameboroke/xPhjIhh/amino_undertale_download_apk_pt_br.pdfIn PDF document text
    • https://gixovazaviv.weebly.com/uploads/1/3/5/9/135982549/9433786.pdfIn PDF document text
    • https://cdn.sqhk.co/vejuwozigef/gh1qjdO/mivemaxiran.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/jedeneseba.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/xuseditifobezosodosuda.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/how_to_write_report_in_english_format.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/tata_mcgraw_hill_instructor_resources.pdfIn PDF document text
    • https://s3.amazonaws.com/wujanozo/3023580706.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc34fd82-2c1d-4695-a773-560decdd8e9c/rewujojafuseb.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/tujupegemadogejezapoli.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/android_sqlite_insert_nullcolumnhack.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/british_sport_tv_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/miniature_dapple_dachshund_puppies_for_sale_tulsa.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/badlapur_2015_full_movie_mp4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bee7350-6da4-4dad-8d82-1a13c08923d7/the_non-designers_design_book_github.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_off0001000b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000B 5400 bytes
SHA-256: 1e4bbd8a2f391f5723025b3c18143f4a3b8b142a73761c01fe3084a2981b5043
font_01_sfnt_off00011268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11268 10592 bytes
SHA-256: b63175414aab2b3597511fe87ed87f65cb3b4f5068a42ab9e046d6d24d09623c