Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e8c5cf1bda12116…

MALICIOUS

PDF

81.7 KB Created: 2021-03-25 04:00:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d4eb47a47459000ec9c2369774b3dabb SHA-1: 1858adfd040e5cecf6e029552fbab124dc2c07a8 SHA-256: 1e8c5cf1bda12116e23851eaeb0a5c34c6008823d1783ccc541731a33c3caf9a
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both ClamAV and an ML classifier. It contains a significant number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The document body is heavily obfuscated and contains what appears to be metadata from wkhtmltopdf, suggesting it was programmatically generated to host these links. No scripts were extracted, but the presence of numerous external links points towards a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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=how+to+move+objects+freely+in+sims+3 PDF link annotation
    • http://konolux.medianewsonline.com/nnpc_aptitude_test_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461525/normal_5fca3a14b1eec.pdfIn PDF document text
    • http://lozejebivo.scienceontheweb.net/82293001782.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465908/normal_5fd0e44a6650d.pdfIn PDF document text
    • https://falufanimuv.weebly.com/uploads/1/3/4/3/134377488/1758036.pdfIn PDF document text
    • https://jozinuzo.weebly.com/uploads/1/3/2/7/132712000/2f6cb.pdfIn PDF document text
    • https://riwaxetonebena.weebly.com/uploads/1/3/4/3/134363930/5efb5200d977.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445570/normal_5fe1b5203f6a5.pdfIn PDF document text
    • https://jiwosanoxonu.weebly.com/uploads/1/3/5/2/135299962/bovumixo.pdfIn PDF document text
    • https://jagalanir.weebly.com/uploads/1/3/1/0/131071056/557a6b58380c.pdfIn PDF document text
    • https://dotanivim.weebly.com/uploads/1/3/4/7/134705276/fezokimopadurawoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475866/normal_6039ec450ef62.pdfIn PDF document text
    • http://netolenogafa.getenjoyment.net/fugamupekalogukiwiduk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488570/normal_60301c7c93759.pdfIn PDF document text
    • https://puxupukesif.weebly.com/uploads/1/3/0/8/130813524/xevotiwamoxuti_vivikodejuvowug_wogumek.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/9177e27e-3c55-43b9-a8c9-57785eb3ea2a/33792126762.pdfIn PDF document text
    • http://bototiluwoge.atwebpages.com/10885142382.pdfIn PDF document text
    • https://1ce8651a-bfbb-4b9a-b1bf-24b3b574775a.filesusr.com/ugd/ac72e0_60c560b5558941f08a1ba65d4cab2ee2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1b5b5ff-22bd-4e9a-be1f-e86ed49d9800/free_ripple_stitch_crochet_scarf_pattern.pdfIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_95e09ce098a94fb29ba09915f50fb005.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8868e59a-6e3e-4fb2-99f2-79a65b71f04c/43696505643.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7fb67dd-1012-40bb-9332-30ca5ad683f2/33407071284.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB11 5412 bytes
SHA-256: d607beea3dcaf5f7251c9cdc34acfc85544b2e90e22e959b7c05e45d21470289
font_01_sfnt_off0000fd8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8D 11164 bytes
SHA-256: 1bf5072f67b0eef388ad9fc1ba1d6fd583e60695111f33091058fa483a1089cd
font_02_sfnt_off000123a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A6 16104 bytes
SHA-256: d2703eec0843ee934b0a8bba7850da2550094fb4af61d17619ccbf35009047d2

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