Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1cab526a98e025f…

MALICIOUS

PDF

77.5 KB Created: 2021-05-23 00:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73e78fcb05d5d877f86990d21a7d4d59 SHA-1: 71c5b9591de8166c296b8d8c99d7d72bc9916ac5 SHA-256: b1cab526a98e025f5c984f69e640d3b456095edec49f2d850d260ca432812456
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and trojan distribution. It contains numerous external links, many pointing to PDF files hosted on Weebly, suggesting a link farm or download lure. The document body, though heavily obfuscated, contains URLs that appear to be related to game downloads, likely a pretext to trick users. Crucially, the file includes instructions to disable security software, a high-risk indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://botokaw.ru/strik?utm_term=yu-gi-oh+legacy+of+the+duelist+pc+deutsch+download
    • https://xebutalumibafa.weebly.com/uploads/1/3/1/0/131070398/200338.pdf
    • https://cdn-cms.f-static.net/uploads/4456135/normal_602a37a05c8c6.pdf
    • https://fofapabijutoza.weebly.com/uploads/1/3/4/7/134713913/2392928.pdf
    • https://bubiwodepu.weebly.com/uploads/1/3/2/8/132815961/8935818.pdf
    • https://lodavoxi.weebly.com/uploads/1/3/4/5/134505118/06c4205a.pdf
    • https://voxepobar.weebly.com/uploads/1/3/4/6/134668427/nusaxo-lopirabif-kisofikuludesu-dizojirivi.pdf
    • https://tupokigefadewun.weebly.com/uploads/1/3/4/7/134702618/nogamebavof-sokasaruwu-luwunevojazik.pdf
    • https://lomamunapud.weebly.com/uploads/1/3/5/3/135315780/bazuguji-tulanolaw-konemakibuk-suzinipenetatig.pdf
    • https://zaluvunikuf.weebly.com/uploads/1/3/1/0/131070459/neropa.pdf
    • https://cdn-cms.f-static.net/uploads/4459320/normal_604d94e637e78.pdf
    • https://zoxopabetil.weebly.com/uploads/1/3/1/1/131163737/jugevuromuf.pdf
    • https://kefavevanafas.weebly.com/uploads/1/3/4/6/134633526/7724580.pdf
    • https://cdn-cms.f-static.net/uploads/4483587/normal_6062caca8ca90.pdf
    • https://gokefezenomi.weebly.com/uploads/1/3/4/0/134040807/7858159.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2ee97a43-5985-47ad-8742-3bc7bc5ff517/delimurifotavesavopu.pdf
    • https://s3.amazonaws.com/wisuw/shakespeare_antony_and_cleopatra.pdf
    • https://uploads.strikinglycdn.com/files/8d3c2730-d5b5-408d-adef-cb47f1e9e859/ff7_walkthrough_after_kalm.pdf
    • https://uploads.strikinglycdn.com/files/2096df36-aef7-495c-acd4-537115f2b50c/44785257597.pdf
    • https://s3.amazonaws.com/sebunuzu/algebra_1_student_workbook_answers.pdf
    • https://s3.amazonaws.com/xeroguru/degopezefajageke.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3c1.bin
33ef1d46a81178da8025f809a062cc7441ae8e70a7f15ca6f0792f29c37d7487		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C1 5508 bytes
font_01_sfnt_off0000f6a4.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A4 1800 bytes
font_02_sfnt_off0000ff31.bin
0d008a09493455dd6343dc0c45018baf5f56b3f35856e6c2489946ceb0fd8a98		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF31 11992 bytes

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