Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6daf0fa906314ee…

MALICIOUS

PDF

75.1 KB Created: 2021-04-23 21:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ec5982b048454fc4f7afee422cb984ff SHA-1: 231faa25b55678622399c87849322d3b07db4bb5 SHA-256: d6daf0fa906314ee86600ca577073068fb224807234c076aa70823295b494063
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://ponafet.ru/strik?utm_term=is+cyberpunk+2077+on+ps5 PDF link annotation
    • https://zekawumili.weebly.com/uploads/1/3/4/4/134403966/7945324.pdfIn PDF document text
    • http://lifeeuro.info/63810945199bpto7.pdfIn PDF document text
    • https://gimeboxevamovuv.weebly.com/uploads/1/3/4/4/134494840/gapikulatadu.pdfIn PDF document text
    • https://werumitepoli.weebly.com/uploads/1/3/0/7/130739038/5927236.pdfIn PDF document text
    • http://5-euro.info/96883374467udofm.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/a0f02dae-2e84-4280-8084-23a93b2626c8/feposuxinosaxavalapo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dace7ad-4539-4681-8241-2647962d2d0b/best_dd_dice_trays.pdfIn PDF document text
    • http://larazegabolulaf.epizy.com/one_piece_bounty_rush_reroll_guide.pdfIn PDF document text
    • http://vejojivusuze.rf.gd/46092349457.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/hold_on_chord_overstreet_musicpleer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/287600ac-134a-4b5b-ab84-029e887a5d67/4th_grade_fluency_passages_texas.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/63464976091.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a89b78ed-c91a-419d-860a-5c6b7b39d970/74721397325.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ad2d43b-7c19-4b80-8c30-7b6f0f21fc9f/89805754467.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb6ba8bc-95cc-4417-8531-266aba69160e/s3_is_cyclic_or_not.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_off0000e819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE819 5404 bytes
SHA-256: ece75e8165ff5f89bd51aa51fc0699c5d4d650da1397803d34a4b2a35c98ff77
font_01_sfnt_off0000faa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA8 10968 bytes
SHA-256: d5f5083c72477a122a8f2662db919afac93c1531a152582ca07b9dce466605a2

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