Malicious PDF — malware analysis report

Static analysis result for SHA-256 da37dacdc303904f…

MALICIOUS

PDF

77.3 KB Created: 2021-05-28 00:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fa3c81e8b9a638006f444b26cb3b7072 SHA-1: c9b83b921e03c530df2c194bcc0e76269c5e842f SHA-256: da37dacdc303904f92b339628fa5e746a27e3988fb30760b39f37bc32d0024b2
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many of which point to SEO redirectors and link farms, indicating a malicious intent to drive traffic to potentially harmful sites. The ML classifier strongly flagged this PDF as malicious. The presence of embedded URLs and the overall structure suggest it's designed to trick users into visiting external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://gimoguvi.ru/strik?utm_term=ge+universal+remote+33712+codes PDF link annotation
    • https://gekowodi.weebly.com/uploads/1/3/5/3/135321574/febusitumawan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476150/normal_605fab8313902.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452171/normal_605a424013d05.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496585/normal_6002be4e4d2af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366327/normal_60245be476239.pdfIn PDF document text
    • https://rulodewarozuw.weebly.com/uploads/1/3/4/6/134678260/3925326.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466366/normal_5fc836b89515f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505699/normal_601af5ad87a7f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477369/normal_5ffb90872b2a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387929/normal_5fda56514fa55.pdfIn PDF document text
    • https://tetaretutu.weebly.com/uploads/1/3/4/8/134872422/482369.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/c4dcece3-554d-4d52-b0e2-7e796f20d0aa/how_many_words_in_war_and_peace.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44270f54-214a-466d-8106-99be2b2fd35e/css_commerce_and_trade_group_subjects.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd721dca-3552-4632-9bd8-afc1bb82b6a2/safaseramima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7d63ffd-794a-4f8c-8fcf-5f2c94124beb/38256741952.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48f3b8b9-6bd1-4768-b56e-74f790e8dc98/90440615159.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f26c8c5-7f30-47ee-a5c8-b16df175522d/94994001672.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/539f2f5c-6d43-424e-93e4-1ea8321233a4/xinetojejofagunatozemi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee4f201a-0fa8-43ff-b4ff-a835cf0c46ef/how_to_become_a_business_operations_manager.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_off0000efe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE7 5604 bytes
SHA-256: debff33181477528ec297f298db6d21726f4150d02f9246bbb4325b67517b925
font_01_sfnt_off000102ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EF 10696 bytes
SHA-256: 9b2f66784159eab2c7be45377e81cc0ffbcb7cdd220383f6802ef2c2d45c2b94

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