Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa6aa751fd67010a…

MALICIOUS

PDF

81.3 KB Created: 2021-09-09 10:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1dc5ca2870658e75916f0f56320d331c SHA-1: 8461b983f279005fcf37132825d58d2fca67ed84 SHA-256: aa6aa751fd67010a9479fb30975158285a1e59c69e0aae275b25d81b2f996a27
66 Risk Score

Malware Insights

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

The sample is a PDF file flagged by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm. One heuristic specifically identifies it as a 'PDF_SEO_DISPOSABLE_LINK_FARM', indicating a likely attempt to manipulate search engine results or distribute malicious content through a network of linked pages. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 4

  • 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://lsphc.com/userfiles/file///42864783085.pdf In PDF document text
    • http://eros-arena.de/eros/userfiles/file/wepabujepigur.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/kegovuza.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/12557392837.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/62438198900.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/nawarujo.pdfIn PDF document text
    • https://etimes.mn/uploads/files/75932654856.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/fipukopewofora.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/33626730483.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/20968998643.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/romevigazixilimileruku.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/32355611324.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/nojipuwatojosex.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/55170436304.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/42345380810.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/78875616858.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/rigiluxegu.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/3751047151.pdfIn PDF document text
    • http://yuli-china.ru/d/files/29367408453.pdfIn PDF document text
    • http://parfumland.sk/upl/34674795035.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/resowurefenagafolewapa.pdfIn PDF document text
    • http://xycrusher.com/d/files/dosituvulilesawef.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/fojezox.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16131e271890cc---folejomifukotibodatoriz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=123movies+harry+potter+deathly+hallowsPDF 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_off0000d480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD480 11068 bytes
SHA-256: 040bb76ef7bb6dc9a5c4ea2be0a42c4736c1238aa9959887f39c2de92d8e2f1b
font_01_sfnt_off0000ee6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001067d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067D 18864 bytes
SHA-256: 42610eb6c999af4b0884a421099e2ee61f20033b95b57196709aa81ed553f099

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