Malicious PDF — malware analysis report

Static analysis result for SHA-256 3618460a243c32da…

MALICIOUS

PDF

110.4 KB Created: 2021-03-23 21:37:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61c819822e6935195d6da852fbb45711 SHA-1: 25938b1958fbebfeba631ddbbee44bbb7627e89b SHA-256: 3618460a243c32da293d754a68e6f5a357439509a9e9ad0544461da3c56d491d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified as a link farm, with the primary URL pointing to a suspicious domain. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious content, potentially leveraging embedded JavaScript for obfuscation or further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/wix?keyword=grab+knife+script+v4
    • http://shtangennstutkupitseychas.xyz/jamejovaveninopagomeswyyqe.pdf
    • http://dejafonuzu.iblogger.org/pdf_asm_handbook_alloying_understanding_the_basics.pdf
    • http://jirazabewofi.22web.org/what_is_a_literature_review_in_a_research_paper.pdf
    • https://cdn.sqhk.co/radageroboko/hg3Rhbx/75816818581.pdf
    • https://cdn.sqhk.co/liminekaj/PibGhbN/origami_star_instructions_youtube.pdf
    • https://cdn.sqhk.co/kokijunuxagi/SYgihd0/free_photoshop_for_android.pdf
    • https://cdn.sqhk.co/sosobita/eFQ7oji/knights_of_the_round_table_story_summary.pdf
    • http://prodson.space/nordictrack_treadmill_c2255_manualhgxk7.pdf
    • https://cdn.sqhk.co/nopawuwam/gfs1ofX/sedivaxokokapinijemefa.pdf
    • https://cdn-cms.f-static.net/uploads/4387243/normal_60483cbc65d56.pdf
    • http://hookup158.fun/historia_de_mexico_2_bachillerato091p8.pdf
    • https://cdn-cms.f-static.net/uploads/4456143/normal_601f304bab58a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • http://suserol.epizy.com/46055504019.pdf
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_719fcc4bb38049428f70a7a4f54983e9.pdf?index=true
    • https://f2203da8-4034-475c-a980-a37079f2cd7f.filesusr.com/ugd/d29026_f7243ba5171b41eaac4a3e1c0a5c24cb.pdf?index=true
    • http://bususetut.epizy.com/94925365962.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://www.gnu.org/licenses/gpl.html
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013b60.bin
66911d61d032a6b9225055c35fc6cdc7a873c2520d0367412755ceb39f7f6b76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B60 5360 bytes
font_01_sfnt_off00014db3.bin
bdd6436326a7e4bfefd0629abee5a74d6b37c30d9dd8769e1ec5efa6ff5780c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14DB3 7456 bytes
font_02_sfnt_off00016207.bin
a444c00797e381aeb7e6ca607737a382be4768fdd396a486f6d947592681c969		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16207 16188 bytes
font_03_sfnt_off000194bd.bin
70d4c8529d3152bedd0ced5c38fe75874a2c95a9ecf89ae775ba09f97d1dc1c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x194BD 16408 bytes

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