Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d9d53500568daa1…

MALICIOUS

PDF

77.1 KB Created: 2021-03-26 09:11:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 549b1af9133b4704e852c948b1d372c4 SHA-1: b31ade2df8c0b5f263ddacaed02d8514df42bfdc SHA-256: 9d9d53500568daa161951b0b691ade89fe5a11b5a34faf697e91e4a89d5ee999
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One prominent URL, 'https://seumenha.ru/strik?utm_term=washington+dc+airport+hotel+shuttle', suggests a lure related to travel information. Another URL, 'http://pexukakadom.22web.org/98202172769.pdf', is also flagged as a potential entry point. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://seumenha.ru/strik?utm_term=washington+dc+airport+hotel+shuttle
    • http://pexukakadom.22web.org/98202172769.pdf
    • https://nerilumasufut.weebly.com/uploads/1/3/1/4/131437044/kuseforifosu.pdf
    • http://bujenaro.scienceontheweb.net/accounting_income_statement.pdf
    • http://nitiwomifigurod.mygamesonline.org/calvinismo_vs_arminianismo.pdf
    • https://bobilomagavakux.weebly.com/uploads/1/3/4/8/134868487/3285648.pdf
    • http://newuwedeza.mypressonline.com/mavufura.pdf
    • http://xovitixekewelom.scienceontheweb.net/katalog_arisan_mapan_juli_2020.pdf
    • https://xobalodag.weebly.com/uploads/1/3/0/7/130739625/jenufumuvosub.pdf
    • https://tavugalijob.weebly.com/uploads/1/3/1/1/131164394/7031470.pdf
    • https://vokujesezi.weebly.com/uploads/1/3/4/3/134306830/125ab5bf570e.pdf
    • https://kofodurulivikaf.weebly.com/uploads/1/3/3/9/133997487/81625fb244403.pdf
    • https://sosepokapebovi.weebly.com/uploads/1/3/0/8/130814645/5643586.pdf
    • https://zolotamazuragif.weebly.com/uploads/1/3/2/7/132712333/zonezego_saretidupew.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pixuxurarosu.epizy.com/converting_units_worksheet_doc.pdf
    • http://kepukafinuma.rf.gd/10th_social_science_book_english_medium_in_download.pdf
    • https://uploads.strikinglycdn.com/files/f2270860-f632-450a-83e0-f9eda46e882f/the_foolish_fish_poem_summary.pdf
    • https://uploads.strikinglycdn.com/files/ea2c3350-2d1b-485e-9a86-107ea723866d/desefor.pdf
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_c499a7c2535740ba985afddc3f4d53f1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1ae87b6b-95bd-4106-80f6-9c36814f65d2/will_any_wifi_extender_work_with_fios.pdf
    • https://uploads.strikinglycdn.com/files/ae9eb560-cd69-4f8a-93ee-4d5d7522c6a3/1072831953.pdf
    • https://uploads.strikinglycdn.com/files/7175b005-1cf3-4fbf-8039-b6a4dda64727/75000404405.pdf
    • https://ee897e78-a157-4eb5-8a47-d615096087a2.filesusr.com/ugd/113e89_650218fcfc684916921e3b4652a3fb42.pdf?index=true
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_56179e3b39884ab4be25f403e4a07124.pdf?index=true
    • https://b9a4c3d6-4ccf-4d04-9b0f-c2e9c357e15d.filesusr.com/ugd/e5cbe5_fdb5a310e319463a828c58a80b131502.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec5f.bin
17888b1577b916189f7d57326e73d3de38de5faf321523110313c8e5df501b1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5F 5348 bytes
font_01_sfnt_off0000fe98.bin
62d67e7390cd712ba468523062f363e2dea6abcbdb95c6bd2d804f8e9fd9ba58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE98 11228 bytes

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