Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e09534da31dbdda…

MALICIOUS

PDF

82.8 KB Created: 2021-04-01 20:36:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc2566af9ab43935848835d78598102a SHA-1: deca3bf7abbd802157b2bec5562929d4059f4abc SHA-256: 7e09534da31dbddad5fffe0c7bef0d9af51629a65074b509fb861f942f022574
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including a critical finding for a PDF link farm containing numerous external URLs. The ML classifier and ClamAV also identified it as malicious. The primary attack pattern involves directing users to external sites, as evidenced by the numerous URLs, suggesting a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/award?keyword=avivamento+pessoal+pdf
    • https://sowibize.weebly.com/uploads/1/3/5/3/135348762/7301463.pdf
    • https://serivuzoforin.weebly.com/uploads/1/3/4/3/134334639/3910803.pdf
    • https://cdn.sqhk.co/vefapatape/MnCrgfH/34680709635.pdf
    • https://gawakugoful.weebly.com/uploads/1/3/4/7/134757428/doxozugukavot-jamirazoxogogun-tedap.pdf
    • https://cdn.sqhk.co/disonixures/mibigjb/time_of_exploration_strategy.pdf
    • https://kutemipemowu.weebly.com/uploads/1/3/4/8/134860595/507001da9.pdf
    • https://gagavupotiwek.weebly.com/uploads/1/3/0/8/130813998/c88cb5d3a.pdf
    • https://nikoxutaju.weebly.com/uploads/1/3/1/3/131378952/c5d41de3b58.pdf
    • https://girawosanisab.weebly.com/uploads/1/3/0/7/130740609/a95fef45545007.pdf
    • https://soravetojovon.weebly.com/uploads/1/3/4/8/134890923/e1c6b3e8b9736cd.pdf
    • https://cdn.sqhk.co/nifodotiriru/haHljfx/ketapumufugitakabetu.pdf
    • https://nifatukipukixe.weebly.com/uploads/1/3/1/3/131398430/7c85ff6d.pdf
    • https://pokumajapemen.weebly.com/uploads/1/3/4/4/134490217/fobovebu.pdf
    • https://zatibuvox.weebly.com/uploads/1/3/0/7/130738619/8309466.pdf
    • https://cdn.sqhk.co/paxepedamaxa/j2qlswm/biacore_spr.pdf
    • https://cdn.sqhk.co/zapevexuvot/ear3Aht/94893579307.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://e301b21f-f707-426c-a094-6199d4b1a2d6.filesusr.com/ugd/f65518_cf4037ba907a45c891cb2674150a3cd1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ca4e1833-708c-4cde-a8a6-ec613c08e2ec/xumalanenerew.pdf
    • https://uploads.strikinglycdn.com/files/eb6e34bb-992a-43ce-9c84-64a6b533a313/how_to_reset_netgear_n300_wifi_extender.pdf
    • https://c44f4a6d-8922-4093-a150-c9e6b6244fdd.filesusr.com/ugd/b371d9_242db6ea24754b3b8b8d1d2c0473fa4c.pdf?index=true
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_2f61fa93c02f4946b2b356080b1c3eef.pdf?index=true
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_095d899f4b15469dac171484bedf3869.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d9edbbd7-3ea8-4444-a327-2ef02d83d80d/wikigatufudamixal.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f73b.bin
4ab1a9ffc0503cbe108a694e549e8ee413b71e36c3ef31c522b859afd829d3a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF73B 4928 bytes
font_01_sfnt_off000107ee.bin
b7b987b1ec0eba47bab686b8f12fa9d0081460a733d9c873bfe0ce0bddc34d37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107EE 12800 bytes
font_02_sfnt_off00012e6f.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6F 4324 bytes

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