Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad55a7036198c20…

MALICIOUS

PDF

82.9 KB Created: 2021-03-25 21:49:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d41051d89e6fd821e1acb9c3e36c9cf5 SHA-1: ec466735663c67bfc542e762c334098d034d92eb SHA-256: fad55a7036198c201b9eb7a8bcc6ea2236cc2093df779813c55244e1e450fdb1
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, forming a link farm, with one prominent URL suggesting a lure for 'Wifi router master apk'. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest this document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/wix?keyword=wifi+router+master+apk
    • https://cdn.sqhk.co/baruduwege/gfjeHgc/57746960970.pdf
    • https://keguvetazako.weebly.com/uploads/1/3/4/7/134702613/6641486.pdf
    • http://opticsystem.website/94092697709cheu6.pdf
    • http://varistop.site/kedubazujurebepiguzivth94i.pdf
    • https://tujozidu.weebly.com/uploads/1/3/4/6/134694944/sipesifupo.pdf
    • https://cdn.sqhk.co/fetebutujo/WhghaFR/46905167036.pdf
    • https://cdn.sqhk.co/nozujeraguje/hdhiDja/tiles_hop_3d_game.pdf
    • https://xugibadibexupov.weebly.com/uploads/1/3/4/6/134684970/3416455.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nakepusigazu.epizy.com/que_significa_movimiento_rectilneo_uniformemente_variado.pdf
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_23a754c21b9d49358c7b99b9aedc0a65.pdf?index=true
    • https://b2d1eea7-aef5-47fc-962c-88b5513ecafc.filesusr.com/ugd/3a57bc_716881fcd2f1477985c40fb05a4c6d09.pdf?index=true
    • https://5a060084-92f5-4e09-b02e-bbac8bb45871.filesusr.com/ugd/05c943_abf524a301574c70a59ff93c2167462b.pdf?index=true
    • https://45f0f727-c607-4398-b3b7-8b42e23b21b2.filesusr.com/ugd/0a84ca_b5550a56a2804e959fa9307cd4b8f939.pdf?index=true
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_0d2dfc55369148339b88be0e6b42c909.pdf?index=true
    • https://f9fc249e-2e6a-4908-9eb0-88005465a50d.filesusr.com/ugd/2530ee_5a28d35161d4433eac4a0b5e5f59323e.pdf?index=true
    • http://burupilejeg.epizy.com/bejuwoxusegubizizegu.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://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_off0000e705.bin
3a99bfcc8a6322cb1f5d9dd0c76c95525b0630114fc12c53a342d41e6b6e0e01		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE705 2960 bytes
font_01_sfnt_off0000f175.bin
05cfb91cfeebc3fd29149e7e818d66dadb433f776134037481892dcd703a6db0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF175 5092 bytes
font_02_sfnt_off000102be.bin
08f5ea96a21272e40a03cbcaf20bdd9a246afbd41139033eda571c35de1a1ee5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102BE 11252 bytes
font_03_sfnt_off000128fc.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128FC 16204 bytes

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