Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aa991d816994d5b…

MALICIOUS

PDF

83.3 KB Created: 2021-09-10 08:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 22d9be13300cfce716e7eb38711a2a29 SHA-1: 41b0ec3d9e624523e8376dfdc2316522a0c588db SHA-256: 2aa991d816994d5bb4f9d3099b1be727bf4d771a431e19b0897004d4af242b93
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, with one specifically mentioning 'download gta 5 for android mod', suggesting a lure for potentially unwanted software or phishing. The PDF structure and embedded links point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=download+gta+5+for+android+mod PDF link annotation
    • https://dagvandearchitectuur.be/_files/file/64375656702.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/40225786958.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/xosevenubobotomatukuxim.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/11296735038.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/bolaz.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/75673751614.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/53971759859.pdfIn PDF document text
    • https://kccegis.com/upfiles/content/file/20210909032215.pdfIn PDF document text
    • http://p-energo.ru/content/file/vudopotikokitusuja.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/98220562831.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/16963622359.pdfIn PDF document text
    • http://pyhunlian.com/uploadfile/file/legudaxir.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/58796619442.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/55957233375.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/kuxemefapawokirinezux.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/64362130424.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-6/20210906131953252708.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/87526344086.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nivimebupike.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/wowemejoravimoneri.pdfIn PDF document text
    • https://vestol.bg/files/file/61492331294.pdfIn PDF document text
    • https://everestart.com/images/stories/file/walemipifipifugaxomijawil.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/nalariwegukoraxemiwofot.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/bobebe.pdfIn PDF document text
    • https://frisch.ro/files/file/fumefixisunivuxubobilitu.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ab3db6a51---84849273828.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_off0000e0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A4 18128 bytes
SHA-256: bc387f28d24abbd736a0614efc298dcf7f0a5073918e76adc91b8c364a077ff4
font_01_sfnt_off00010f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12776 10620 bytes
SHA-256: 591ca15850556b0e8d8d1d5e6989d7736fda14e3a5d66296ee387ceae1b175f4

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