Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea702be18fa63c3f…

MALICIOUS

PDF

87.4 KB Created: 2021-03-31 22:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: beb236fce88b65ced3fe86cf2eee164b SHA-1: a0081c002d588f5e706e252ed68db680a88eeba7 SHA-256: ea702be18fa63c3f917dd0a7e5a7bf207225999b1da0e437e439d53e13df7086
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many of which point to potentially malicious or unknown domains, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to be a lure related to academic search terms, designed to drive users to these external sites.

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://nipisod.ru/wix?keyword=waves+on+a+string+simulation+activity+answers
    • http://terugate.mypressonline.com/36150996098.pdf
    • https://goxanakevixi.weebly.com/uploads/1/3/4/8/134857001/796c471683f79a.pdf
    • http://doniposebuk.iblogger.org/23706325727.pdf
    • http://lomigakorak.getenjoyment.net/96153428719.pdf
    • https://xejapekedom.weebly.com/uploads/1/3/4/8/134864907/729a466fd5c899.pdf
    • https://laxuruvu.weebly.com/uploads/1/3/1/4/131482832/5a357a67baf.pdf
    • https://pemalerokefoge.weebly.com/uploads/1/3/1/6/131606165/vejojinamebuka_bawisedox.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/df4f36f4-2aea-4fe9-82e4-da7f937ccd14/work_stress_and_health_the_whitehall_ii_study.pdf
    • https://uploads.strikinglycdn.com/files/ac4e36b2-7d9b-4f2a-941b-eb1baf895371/healthometer_scale_error_lo.pdf
    • http://jufakoxageponuz.rf.gd/navy_electrician_mate_study_guide.pdf
    • https://uploads.strikinglycdn.com/files/3e4bf973-ef5c-464a-b0a5-cfe0d0ef2da3/72497790928.pdf
    • https://uploads.strikinglycdn.com/files/225623c2-f585-4ba9-8712-ea4ef80735c2/natigojunome.pdf
    • https://uploads.strikinglycdn.com/files/392b98c6-6006-43e7-a5ed-db7681dae977/graco_fastaction_fold_jogger_click_connect_stroller_orange.pdf
    • https://uploads.strikinglycdn.com/files/943e6e58-a8b1-444e-b59a-710351b4af43/73914988932.pdf
    • https://uploads.strikinglycdn.com/files/ce3f29ce-35ab-43aa-8e9c-b484382b8364/19815603958.pdf
    • https://uploads.strikinglycdn.com/files/8b6c7c2e-4cb9-46cb-9048-07d826f55e06/88456795758.pdf
    • http://kitutexedifepi.epizy.com/lonely_planet_budapest_download.pdf
    • https://uploads.strikinglycdn.com/files/3a1455f1-52fe-4766-b362-92ce38fc7b79/zijagodebez.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2c2.bin
0cda4cc8108e5442ad4885b1ba0d22c9bf639b3035b23168940253b1ef14d5e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C2 11600 bytes
font_01_sfnt_off0001087a.bin
b4f3d1253828b402bc042b110ce0c92164d78977b39ced4f3125c0ee30652635		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1087A 5268 bytes
font_02_sfnt_off00011a65.bin
1b311b643c9f165baa1761e0f79a95fb8bf48a79b20b3c677ac574b68188f7ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A65 12528 bytes
font_03_sfnt_off000141ec.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x141EC 4324 bytes

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