Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90df102a58accec…

MALICIOUS

PDF

72.7 KB Created: 2021-05-21 14:36:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 0c25ea2abec27f2f3729db8468f6b7e7 SHA-1: b88278a00694caa88aad8dd5e3f4159dc02c269a SHA-256: d90df102a58accec988957e597cfb5b90d851326322b335c7678c9e164a6665b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized to appear as legitimate search results for specific documents. The primary malicious URL, dugedepap.ru, is likely used to host or redirect to a malicious payload. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or malware distribution scheme.

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://dugedepap.ru/strik?utm_term=el+muro+jean+paul+sartre+pdf+gratis PDF link annotation
    • https://rubuxunixo.weebly.com/uploads/1/3/4/5/134518382/4824524.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451210/normal_604da68fa1e49.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451365/normal_5fcdc862206fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367005/normal_60658f9ba02b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381291/normal_5fce474706c8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484995/normal_5ff2506cc4349.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489843/normal_60465dd0a2a6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497358/normal_5fd77b17a3fc6.pdfIn PDF document text
    • https://nijusalelazi.weebly.com/uploads/1/3/4/8/134875584/mamamenuvu_berosaw_mepadu.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/ebab5517-8ffb-478e-900d-414383c57034/hauppauge_wintv_v8_activation_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45a885f9-257f-469f-bb3f-15a9565fdf14/difference_between_qualitative_and_quantitative_research_sample_size.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/canon_rebel_t5_battery_charger_target.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b84d55bb-d06d-43d3-b4b3-8247d3643c15/how_to_use_a_seamstress_sewing_machine_thread.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/564a6707-23d5-4778-b5a3-05ed71c3b07b/61415042131.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/d_accord_2_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2103bd25-9f67-40fd-a3e0-2a6ff231a15d/luvutidikasamaxirezab.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9E 5396 bytes
SHA-256: ec733cf5364f8789a4f1e8d3901582a2f8b1f83a2923493bcd679ef83d5dda3c
font_01_sfnt_off0000ede8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE8 12628 bytes
SHA-256: c50660382ca8dd642eea37a59463952c57d5c47426b5cd252f1e67ede4e33b7d

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