Malicious PDF — malware analysis report

Static analysis result for SHA-256 da46ad59b588a9f0…

MALICIOUS

PDF

74.1 KB Created: 2021-09-28 18:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 541d95cc62a93ffa2c12f003640d8e75 SHA-1: f7e7599326313ee232ef9c6f9583906c4347dd23 SHA-256: da46ad59b588a9f02281a9672e586e88a00ec90e3e26f2a64a5c1b16def515b1
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the document being a link farm hosted on disposable domains, with one direct link to a PDF on an IP address. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL analysis suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://gesundezellen.com/neu/userfiles/file/vevuzoxaraworenatiguwojel.pdf
    • https://gemicilojistik.com/userfiles/upload/file/nobote.pdf
    • http://yangpupark.com/uploadfile/files/75494158146.pdf
    • https://anukulagrotech.com/ci/userfiles/files/begodu.pdf
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/pelida.pdf
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/35133792475.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149a61264846---lewikajuwazep.pdf
    • http://formpart.com/upload/ckfinder/files/61027591659.pdf
    • http://185.33.116.145/~acus01/upload/files/megazezatiwidej.pdf
    • http://hqshop24.com/userfiles/file/fixirete.pdf
    • https://cottingham-group.com/cufiles/files/gasuxilepeg.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/161324527d01e6---40317055671.pdf
    • http://faceconnects.com/ci/userfiles/files/1685161474.pdf
    • http://astprom.ru/sites/default/files/file/69628230407.pdf
    • https://atputasbaze.lv/images/userfiles/files/91589980391.pdf
    • http://cx-gl.hu/images/files/31029378139.pdf
    • http://manpukulivermore.com/uploads/files/25813455556.pdf
    • http://szzxwx.com/Upload/Upload/file/20219211930151083.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/vezebizuridixadix.pdf
    • https://vpmemorial.net/images/file/12064085419.pdf
    • http://aj-freight.com/ckfinder/userfiles/files/buwalolixanovukugiramim.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=comment+supprimer+des+applications+sur+android
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb30.bin
47abe8aecf21486452e2b941cb825acf009023c00727d3613aa3f14d1002d41d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB30 18148 bytes
font_01_sfnt_off0000e9b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B8 16792 bytes
font_02_sfnt_off000101cf.bin
7d400b3e1d46726464f1ac2fc1199015253d56193ae5902105eec264e85a3cb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101CF 10804 bytes

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