Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f69fe1a20b6f62…

MALICIOUS

PDF

70.5 KB Created: 2021-09-28 16:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d2f4779ca4ba2ca57882a82ca94954f9 SHA-1: 633f071f437b5c5ef05235d0f63ee48e612a10c6 SHA-256: a7f69fe1a20b6f62b73f76ca58412801cb18b30c49c17db47c293f4e9751abf5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous links, many pointing to disposable domains and employing UTM parameters, suggests a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution lure, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://raselapp.com/userfiles/file/nosadedodunoladozibax.pdf In PDF document text
    • http://stonepigments.com/userfiles/file/pixizobapuw.pdfIn PDF document text
    • http://all-premium.com/user_file/files/62110844466.pdfIn PDF document text
    • https://phukienbep.net/media/files/lujirizananagaguziziso.pdfIn PDF document text
    • http://eternaseguros.net/files/files/5667367046.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614e152e2d517---61885680267.pdfIn PDF document text
    • https://atiksigorta.com/files/62632000052.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/gufulonewoxegudizo.pdfIn PDF document text
    • https://breedlife.com/upload/files/68256568408.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/vobez.pdfIn PDF document text
    • https://miet.hu/kepek/kavowowukefezedifakunug.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/zotoruf.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/25370549364.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210910004549.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/madus.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/kubaduwidabisa.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/46749524318.pdfIn PDF document text
    • https://izometal.net/mm/file/wudafusoser.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///60174131643.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/4040648775.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc93465559---vovipepu.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/85281285988.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/sufaxuwedibolarex.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/sovegilurogodaduxasenoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=control+pc+from+smartphonePDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/zodoxusegij.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_off0000b456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB456 10684 bytes
SHA-256: 55a8f10e6e93f295f63e083c5f2a6a95ba69f5a49b3fa47b1b22d07a88457a99
font_01_sfnt_off0000ccb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB8 15572 bytes
SHA-256: 6f73875659747cff1ff65b1bc6f4e59b559c0605c06207516cfea837064842b3
font_02_sfnt_off0000f459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF459 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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