Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dcf9c9801a252af…

MALICIOUS

PDF

78.9 KB Created: 2020-12-19 01:46:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b84f546db3dc7a4028e448b3e10a59ba SHA-1: d2ca311da0bffb30229c1d9536a165e1e852050e SHA-256: 9dcf9c9801a252afa84ec259b5362e3f3d31148964976aa923d49936f9f6bcd0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic and the ClamAV detection. The ML classifier also strongly flagged this PDF as malicious. The embedded URL 'https://trafficel.ru/strik?utm_term=ademco+alarm+system+manual+n8743-3' suggests a phishing or malware distribution attempt, masquerading as an alarm system manual.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafficel.ru/strik?utm_term=ademco+alarm+system+manual+n8743-3
    • https://cdn-cms.f-static.net/uploads/4454436/normal_5fd7075d85298.pdf
    • https://static.s123-cdn-static.com/uploads/4478383/normal_5fdd39db7d5e7.pdf
    • https://mujubafajereked.weebly.com/uploads/1/3/4/5/134595908/ddffd610a2bc4e7.pdf
    • https://cdn-cms.f-static.net/uploads/4367964/normal_5f887dc17ba3d.pdf
    • https://static.s123-cdn-static.com/uploads/4384149/normal_5fcd6498da5c4.pdf
    • https://juzowugaf.weebly.com/uploads/1/3/4/7/134773334/towediwaridon-lurukejef-modeviwasijame.pdf
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/613a711ec7ef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/wovugi/baby_stroller_pics_free.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf27fa97599144ebcc593/1606283904508/get_free_rubies_for_hidden_city.pdf
    • https://s3.amazonaws.com/nabifovu/landlord_tenant_agreement_hawaii.pdf
    • https://static1.squarespace.com/static/5fc6a751bda9c57a97e64612/t/5fc7b7ee7995075abdeea9c1/1606924271507/free_real_followers_for_instagram_app_download.pdf
    • https://s3.amazonaws.com/vuliwisuwig/momoweneravanepajubagefu.pdf
    • https://s3.amazonaws.com/votubukaxogilix/ancient_greece_games_and_entertainment.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1ba.bin
934c6e5e7cec136b453fc5ba9f7ff4ebe639de20392c22abf8a672e9fab24923		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BA 5568 bytes
font_01_sfnt_off0000e4a2.bin
ae0f65a6e44988efab135f8ca06932e05685c1bd3e81caff92a4354e2033fb65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A2 11212 bytes
font_02_sfnt_off00010afe.bin
4682b72f2afa33b20cf875d84024ffdd6778cb348d5560ed491e7fe37e149525		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFE 16192 bytes
font_03_sfnt_off0001200c.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1200C 4324 bytes

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