Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5af55745b22e7e3…

MALICIOUS

PDF

74.0 KB Created: 2021-10-02 19:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8b0f2e6c01f5ae4e6b6a95f8c43c7d1e SHA-1: d72aa2f6cd3a2eb2b4a8a85ddbc09744e43ea7aa SHA-256: b5af55745b22e7e3ebc74c533c6bb2f8019bfb5374f5383e522c3172d902ef26
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving redirection to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=baby+rattle+meaning PDF link annotation
    • http://lgassociates.in/uploads/7674790931.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/kunovoxa.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/41612049217.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/28461822441.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/64350466598.pdfIn PDF document text
    • http://tchid.net/userfiles/file/26209682620.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/muruxuz.pdfIn PDF document text
    • https://basisangka.com/contents/files/89353717878.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/nuxul.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/95334772057.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/xoximaluwi.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/61af231b6651b22edc7e0044d13ee6b2/50737223694.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/60952869723.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/93705292770.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/vidafuzakudader.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/19021697506.pdfIn PDF document text
    • http://artio.pl/files/files/66296876178.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/73285196847.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/8591578102.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/39740127587.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/lutonezolerama.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d545b33148---zotojix.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/talek.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/88016175301.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_off0000b5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BA 20320 bytes
SHA-256: 4d19a1b6197d47afaa1077148d006220af52055a41416007f2aa6505e4eedcaf
font_01_sfnt_off0000eab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CE 10472 bytes
SHA-256: f7a1a6261a22df004a8f06a11e3b0ce089f3c754024f04e7ae8b25f1467a456b