Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f56f872524d447…

MALICIOUS

PDF

80.8 KB Created: 2021-01-02 12:21:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: ff3d49d1a00081ebfbbe936fb54e7f1d SHA-1: c625a17d9b983b4a67ede7669a82e765426269de SHA-256: b5f56f872524d447ba19d175dea779a9a50421f5134a8763b5d21d6223e5a8bb
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting services, forming a link farm. The primary URL, 'https://trafficel.ru/aws?utm_term=human+development+report+2019+india+pdf', suggests a lure related to a human development report, likely to trick users into clicking through to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://trafficel.ru/aws?utm_term=human+development+report+2019+india+pdf PDF link annotation
    • https://fukobararusi.weebly.com/uploads/1/3/4/4/134404541/3490094.pdfIn PDF document text
    • https://rixafewokeget.weebly.com/uploads/1/3/0/7/130739987/bce55ada8fb40e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371495/normal_5f8d6edb59e50.pdfIn PDF document text
    • https://cdn.sqhk.co/fuluzezufe/djfR3rw/46567319062.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370063/normal_5ff007f6dbe09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365634/normal_5f870913686df.pdfIn PDF document text
    • https://sabewuxibiw.weebly.com/uploads/1/3/4/7/134718514/gajibovegipogepikori.pdfIn PDF document text
    • https://xewulowew.weebly.com/uploads/1/3/4/7/134757629/5195375.pdfIn PDF document text
    • https://mobonojijokatu.weebly.com/uploads/1/3/4/3/134320628/bojoxedapadom-jutisanowaseb.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/2248ed96-80ec-4cd9-8821-36a0b28e6fee/juxebeniwukobodanu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c4f0270-9b44-41a2-a7a9-e0b717487b45/cards_against_muggles_deutsch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18a6664b-c7d8-4274-a2f9-ac181dec81bb/35612388255.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/free_real_estate_flyer_template_powerpoint.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_off0000fdb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB6 5512 bytes
SHA-256: e1fed2eacbf312a6f6f00fc36565ab949bb8d646d277a96b658d84a952f3bacf
font_01_sfnt_off00011063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11063 11268 bytes
SHA-256: fb5ce905d7bdc4def72ed04071f2fb90e4fb9baede50eb5c27f2b152c91f10ee

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