Malicious PDF — malware analysis report

Static analysis result for SHA-256 928889d8554977ab…

MALICIOUS

PDF

80.1 KB Created: 2021-09-11 01:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 33980534cd80a51bb29259c1f18e861b SHA-1: 78ec69b88a204f863a6894252f3bae1b8dc19ef0 SHA-256: 928889d8554977abfb6cd98e779fad2bbb20c1694409799cf5efd3bb23050ea4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan PDF. The PDF contains numerous embedded URLs that point to disposable hosting and are structured as a link farm, suggesting an attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://catamma.ru/uplcv?utm_term=introduction+to+operations+research+9th+edition+solutions+manual+pdf PDF link annotation
    • http://cerescommoditiesltd.com/Images_upload/files/fugebuzuzuzetudiniso.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/wubadugajakafeb.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/gulavegujukivudalosumapa.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161307dd7064d4---pedojerorezewupawabekat.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/35191906245.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/81471942037.pdfIn PDF document text
    • http://boldogelet.hu/media/busisil.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/sixovuvakamu.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/98408308800.pdfIn PDF document text
    • http://ropesadventure.com/d/files/gejovovonelofip.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/79016899052.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/4084465149.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109080032381650.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/55682708948.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/83555207908.pdfIn PDF document text
    • https://tekartltd.com/upload/files/pexoselotowemigizovowegi.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/75073398235.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/jilemevodezisevu.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/pidobafuferuvujezolosulax.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/19822902991.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/77777812504.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/72176525284.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD073 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88A 11104 bytes
SHA-256: 22a93be41fb398c3d35df3212c27f4fe0cd717d87422f21f5250a5018fabded3
font_02_sfnt_off0001023d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023D 18364 bytes
SHA-256: 8dd70b0e9d92a4d8e4042e58467738c59d50844facad75f77583e753fdb444f9

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