Malicious PDF — malware analysis report

Static analysis result for SHA-256 32e53d8e2becb288…

MALICIOUS

PDF

79.4 KB Created: 2021-03-05 13:39:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9cecb14a516411105bc20178898ca994 SHA-1: 25aa974503b7740e2f3675c28d0c444230b51f2f SHA-256: 32e53d8e2becb288f5f51223b5d75bab66e4471e657fb09e04ac7f2d0340a334
156 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to 'kuzutuzo.ru', which is presented as a download link for 'tubemate latest apk mod'. This suggests a phishing or malware distribution lure. Additionally, the PDF exhibits characteristics of a link farm, with numerous external links, including one to 's3.amazonaws.com/nazekisigiduz/afterlight_full_version_apk.pdf', indicating a potential attempt to distribute further malicious content or engage in SEO manipulation for malicious purposes. The ClamAV detection and ML classifier further support its malicious nature.

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://kuzutuzo.ru/wix?keyword=tubemate+latest+apk+mod
    • https://kuribigewisowe.weebly.com/uploads/1/3/4/6/134688213/6df40362.pdf
    • https://xososikanezav.weebly.com/uploads/1/3/4/8/134892973/45ac51.pdf
    • https://vetazewufa.weebly.com/uploads/1/3/2/8/132814418/povuluxub.pdf
    • https://varudigenaka.weebly.com/uploads/1/3/4/5/134597471/ba888bf40d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nazekisigiduz/afterlight_full_version_apk.pdf
    • https://uploads.strikinglycdn.com/files/7eab8acd-4568-4164-a13f-b3186d3b5c5f/2181164112.pdf
    • https://s3.amazonaws.com/somisilegex/akelius_residential_property_annual_report.pdf
    • https://uploads.strikinglycdn.com/files/dc60e3c8-4b50-40e0-8acb-8cfc779b84ca/matricom_g-box_q3_android_media_player_-_black.pdf
    • https://uploads.strikinglycdn.com/files/052ea27b-75f3-4ffb-9f13-a93df121149a/nirege.pdf
    • https://uploads.strikinglycdn.com/files/a22aa86c-de7f-4d49-90ae-98a949ceb11f/99430432545.pdf
    • https://s3.amazonaws.com/kodipopujufipig/72719053291.pdf
    • https://uploads.strikinglycdn.com/files/2708df01-e625-4a3d-89d5-08ebcb2e984d/90273491825.pdf
    • https://s3.amazonaws.com/mevuzokekenojab/facebook_app_windows_7.pdf
    • https://s3.amazonaws.com/metakibeme/shoulder_subluxation_stroke_guidelines.pdf
    • https://uploads.strikinglycdn.com/files/2f6fdbf7-f18f-4903-bc9b-9cac49d8a520/28476425190.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_off0000de52.bin
b9d0e0c3d5fe160d333c4297634cd2d9a2312395da8323d096b8d7260e185846		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE52 5164 bytes
font_01_sfnt_off0000efbd.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBD 1800 bytes
font_02_sfnt_off0000f84b.bin
00682ef2e23a6753daeeafb68eade58682c2a4ef15b978d21ab2e7be88212d7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF84B 10224 bytes
font_03_sfnt_off00011b8b.bin
682b98d0697bd8628c40f5b2c6a4ead5ef93030e01f9f6be6c9ec1be1f6504e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8B 16080 bytes

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