Malicious PDF — malware analysis report

Static analysis result for SHA-256 0837afef63b58e59…

MALICIOUS

PDF

42.8 KB Created: 2020-11-05 23:36:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 23687254edd7bcc9e46adbf83bbbb710 SHA-1: df3eadc760c5073eb9299e90cfe36ee9113d7915 SHA-256: 0837afef63b58e59b6a746f1a448b7aa71e251e0a07d371c055f0c680f05aedd
66 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 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 1.0000

Heuristics 4

  • 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://trafffi.ru/strik?keyword=mobicom+2020+chair PDF link annotation
    • https://megadezatesaram.weebly.com/uploads/1/3/0/7/130776649/lezepasidixabazafe.pdfIn PDF document text
    • https://dojumavuj.weebly.com/uploads/1/3/3/9/133997280/dd0ea3b2064.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393499/normal_5f9273901eb5b.pdfIn PDF document text
    • https://vejegiraforid.weebly.com/uploads/1/3/4/3/134311029/pegekuxaratujukasavu.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/b4ab5e6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9558/9018/files/papixav.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/jawiwapupak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2050/1660/files/knowledge_management_theory_in_practice_peter_massingham.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/spilanthes_paniculata.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f3688bb-ddbc-4f5e-97c7-318c2af1c0b9/38998355762.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad951592-d547-4661-b5d7-ad81ecde1c7e/60786674783.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/zidijumefusuxog.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/cnn_10_september_6_2019_transcribe.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/bed_cet_result_2019.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_off000069c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69C3 5248 bytes
SHA-256: d5c37784d3f48ab808c056ad3c3a3c101a2a542301510e51e4438810012131f3
font_01_sfnt_off00007b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B81 10508 bytes
SHA-256: fe9e768c7aed1bd020631bd0ef7751abfeae2d2f8191adb7f511ba14e7241638

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