Malicious PDF — malware analysis report

Static analysis result for SHA-256 579ef454a9be9042…

MALICIOUS

PDF

71.9 KB Created: 2020-11-11 15:13:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 8c3669319c48a6f559a8da43fd8723b8 SHA-1: b7668edc645a5d432c757fffbad73a381f29afee SHA-256: 579ef454a9be904239d5913e6287c247a0e5f430259cbe9b2d53763fae394266
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, including a link farm, suggesting an attempt to redirect users to potentially harmful sites. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

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 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://trafftec.ru/123?utm_term=wagon+wheel+lyrics+and+chords%252F+free+printable PDF link annotation
    • https://tupipukevoluda.weebly.com/uploads/1/3/4/0/134041298/5bd1ef394e.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/susopuzupure/82850698377.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/8661226779.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/pokemon_stadium_3_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39c0877a-19a3-4885-9105-63bad63ee638/46585923253.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/anatomy_book_online.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/zefupuf.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/rigeka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98c755a9-0e5f-404c-9e32-3dd6e458b81c/eternity_in_their_hearts.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/ace_hardware_hawaii_mapunapuna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba2c259b-b84e-44f6-b043-5dcdd3b45dfc/23517629629.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/79889610524.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6ae254c-60f9-4713-bbc8-f40f39479c7b/forward_roll_judo.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_off0000d255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD255 5800 bytes
SHA-256: 7cf5b6df25ce01a51329c36d64e08aa9f2924aa90f3f78032f2af75430390e0a
font_01_sfnt_off0000e630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE630 13844 bytes
SHA-256: 2aff5329fcb3d7defe1d434d3de97a9ccb0547b555fce98e98d405a9a5e56718

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