Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa6382b39699c74d…

MALICIOUS

PDF

77.6 KB Created: 2021-09-14 04:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1e1396de4f07caa9f9d5aaf036e43577 SHA-1: bac4b7a340318c33ad4a2795580090ba70e6ca79 SHA-256: aa6382b39699c74d653d45ef1aeb6126591eb5b82d096a5458a0eae0b3a8fad9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external links, many hosted on potentially disposable domains, suggests a link farm designed to distribute further malicious content or phish for information. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, likely intended to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://asharfilalkulfi.com/ckfinder/userfiles/files/95654590125.pdf In PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/25595763336.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/saxuzerifiw.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/1036940124613968fba7796.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/dojawiwomarerugudi.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/38449865394.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/83725159126.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613b46fe41d34---simuwoxexe.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/valutugevesunamorisido.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/96708888922.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/85841680706.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/49346887323.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/joxodedox.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/basisokebetatigar.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210902130412.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/dilodewunavesifufuvek.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/nanusanebemud.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210907193247.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349ce65e49d---10769444811.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/97413296440.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/16871232043.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/maniban.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=five+nights+at+candy%27s+remastered+android+downloadPDF link annotation
    • 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_off0000c9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A8 17412 bytes
SHA-256: 07eb986e4b0c51e15c18891b1e3b30fe97f4ce577fb74909f42e6d6171e2c30c
font_01_sfnt_off0000f757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF757 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6E 11092 bytes
SHA-256: 92634af85529e655f2c0600fdfff2569a1c2a2f3afa33de2ff21c996509b6983