Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f309654ab144cbf…

MALICIOUS

PDF

87.8 KB Created: 2021-03-22 01:26:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fed553b11e28cb389e1cb5703a08e400 SHA-1: b206187570d2f94931c0d4e66c05b378ffc69396 SHA-256: 1f309654ab144cbf39cc4a7e479e1aae543d1808ccec1e4366d9b11656dac680
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document exhibits characteristics of a link farm, containing a large number of embedded URLs. Several heuristics indicate these links point to redirector infrastructure and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature, likely serving as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=los+juegos+del+hambre+sinsajo+parte+1+cuevana In PDF document text
    • http://rejawulomov.mywebcommunity.org/8796217376.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410030/normal_60107abbbce21.pdfIn PDF document text
    • https://kuxijixa.weebly.com/uploads/1/3/4/8/134856984/pifabi-pojaxapiloruf-denen.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481527/normal_5fed681707b5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471091/normal_6037b19b4e454.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491687/normal_5fec230fd8d83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494433/normal_600df9f4c79a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417128/normal_604f9192739f2.pdfIn PDF document text
    • https://dimegowogox.weebly.com/uploads/1/3/3/9/133999821/xezerowasawerawe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414688/normal_5fcef548454d1.pdfIn PDF document text
    • https://wiwufupa.weebly.com/uploads/1/3/2/8/132814928/nikidizedut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452852/normal_6055ce2169340.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/d7996683-2df5-44ac-a990-037616ca2ed8/nunarutozozolu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3929054-8424-4bb5-ade5-394c499907b1/vipowalaxixufakajopib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fbfbddc-352b-45df-8d5b-50d898d1f8d2/76167355349.pdfIn PDF document text
    • http://peruroz.onlinewebshop.net/most_important_current_affairs_2020_download.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_off000116fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FD 5756 bytes
SHA-256: 44b511f220253fbbf21e8ec9d731d87773515b11bb5b8632dfe4ea85f4bb2e06
font_01_sfnt_off00012a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A74 12312 bytes
SHA-256: 595b7fc89a96277d078f76556ecd17fa3103e64dd50e701d8176359be2a824eb

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