Malicious PDF — malware analysis report

Static analysis result for SHA-256 0231998d6c818a3e…

MALICIOUS

PDF

68.1 KB Created: 2021-04-02 08:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7efc60d9b4f25ba671caec57639eefc4 SHA-1: 151faef257569db1a0b4edda4cadcd008b54fb35 SHA-256: 0231998d6c818a3e4d6001387c930ec22683784af837f6a5ee9431cf1699a694
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=surah+juz+amma+rumi PDF link annotation
    • http://warajuvevuv.medianewsonline.com/dieta_cetogenica_gratis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379837/normal_602e717ccdddb.pdfIn PDF document text
    • http://pidusejop.medianewsonline.com/v2490_foodsaver_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366317/normal_6015a01b5c575.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480397/normal_5fd7cf5885190.pdfIn PDF document text
    • http://ditoterelutas.sportsontheweb.net/what_is_emphasis_in_interior_design.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475582/normal_6036db618f0e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401515/normal_60654ca55ea19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478683/normal_60098b0741103.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489607/normal_6011c75929b34.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jofikuv.atwebpages.com/54859139420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f8ddebc-c5d7-4744-b097-069806648c22/vaniz.pdfIn PDF document text
    • http://ralirajuz.atwebpages.com/geometrical_isomerism_in_organic_chemistry.pdfIn PDF document text
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_28990fab5cb047bbb79db75326d705fc.pdf?index=trueIn PDF document text
    • https://cb38ef3f-1f2c-4622-8962-dca261660167.filesusr.com/ugd/3ae201_c036ad617f2f4b0aa9266a0d33ca546b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/edc920f4-d9e1-4b59-936a-f4f9afa9b87a/43145278358.pdfIn PDF document text
    • https://32cf4326-ba62-484c-a3ca-05d02c2dd2e5.filesusr.com/ugd/0b46e6_4344a09b38024589934a01851736cdfd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbf1cdd8-769e-44c1-a015-5ed7104a3f6a/bufojo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7442d7b9-f79f-4641-864e-2c0e84d03bc6/46287649322.pdfIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_60595c177ec4448a8307e670a510d808.pdf?index=trueIn 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_off0000cd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2F 4944 bytes
SHA-256: 3b89ed5fd82e44b3fcb80a8f3e4392f4e0c9311d5d3a45eb69409e9065ce1448
font_01_sfnt_off0000dddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDF 10460 bytes
SHA-256: 19fe448026c5d42d73a9649dc3d757de8f6e4b32ffeb049b672dcbbd0bbf3b2e

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