Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c80738b1a7c2abb…

MALICIOUS

PDF

79.6 KB Created: 2021-09-19 21:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5e2efdeeba7de019e66513273a7afc4c SHA-1: 40b129508bbb54245ce66465de94470772eac03a SHA-256: 0c80738b1a7c2abb9c6820b6da15e483d21697450209b819c79084b5ce130a48
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan distribution. The presence of a link farm on disposable hosting, coupled with a lure for a 'business deluxe mod apk', strongly suggests an attempt to trick users into downloading further malware. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://elektrostroy.kz/ckfinder/userfiles/files/dupex.pdf In PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/xofuwaforenexumogat.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/kunirowarimomisokumek.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/88883881838.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/14q6k9o9s956r7g017btgmtd57/45658186871.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/rarataximewerozanojuxu.pdfIn PDF document text
    • https://kildevangen.dk/files/dadibivamefu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0c0026906---57467036630.pdfIn PDF document text
    • http://runbo.net/upfiles/files/1631103676359.pdfIn PDF document text
    • http://planetamama.ru/files/file/8445678258.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/78246769262.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/31270143893.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/tinubuwetutulujefuw.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/nujisilu.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/xogok.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021918228149921.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/20257705189.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/27910551419.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/pijixorifarakujixojopak.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/regiregepibigawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=business+deluxe+mod+apkPDF 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_off0000d1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DA 10704 bytes
SHA-256: 8901740d1e968f45976379c0dd82147511e6a00e164db6d8a6cd35d2b45eb049
font_02_sfnt_off00010261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10261 18088 bytes
SHA-256: 7efb7a8a27834f80dff6c14c77164bfea8416525e2fc8ecb6377e0c0fc1aa86e

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