Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab98041f0331863…

MALICIOUS

PDF

70.0 KB Created: 2021-10-01 21:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 67e051b9ee95743494d7a1a60f480c13 SHA-1: e65113e47a6bd24cc972a5c7f3cd422dc030fe90 SHA-256: aab98041f0331863527519f1c050b9c72326b0ac109ae0c5fb30c0c2d455a410
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to potentially malicious or unknown domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags the document's structure as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://hatowo.com/app/webroot/uploads/files/14446593783.pdf In PDF document text
    • https://funbugs.ie/userfiles/file/88034600486.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/nugafurolefubelelodu.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/wajafok.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/zatopodibewafemu.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/repofemezolef.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/77201418421.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/82394979311.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/25961284587.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/vawexejok.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/jurujaritolefubi.pdfIn PDF document text
    • http://tabletopad.com/images/file/75248801389.pdfIn PDF document text
    • http://sasalidayanisma.org/uploads/file/436040624.pdfIn PDF document text
    • http://congluc.com/upload/files/nonorebiga.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/nujitegufixixinanaw.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/53143917769.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/kawep.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/33403323307.pdfIn PDF document text
    • http://vilniausgreziniai.lt/userfiles/file/gudop.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/vilusumopebejonomevimibu.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/75009752906.pdfIn PDF document text
    • http://yztools.com/images/upload/File/44310432370.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210922112658.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=can+you+screen+mirror+on+androidPDF 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_off0000aeea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEEA 17096 bytes
SHA-256: 2a0eafacb722edaf173539a543e55328df96964b5f3522db2b61d18bdb531bdc
font_01_sfnt_off0000da22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA22 10632 bytes
SHA-256: 3a2fac93bd3841db49bdbdb9402143b1e5d251ffabd876abf6309790334ca975
font_02_sfnt_off0000f27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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