Malicious PDF — malware analysis report

Static analysis result for SHA-256 34efbad94a439432…

MALICIOUS

PDF

102.1 KB Created: 2021-03-03 12:39:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: cc5aed3d1e5bc2ffab7c53726b646a28 SHA-1: 9b1a93925f230d23d9d59d497ac3b992227078b1 SHA-256: 34efbad94a439432e7cf7353168dfb8f60c0b14744edd71b671f90d165a656e6
74 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, and the PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to distribute further malicious content. The document body, though heavily obfuscated, contains keywords related to 'lab report' and 'chemistry', likely a lure to encourage downloads. No scripts were extracted, but the PDF structure and numerous URLs point towards a malicious distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://resalured.ru/wix?keyword=lab+report+example+chemistry+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374540/normal_602196af92f65.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/qjjhajh/microsoft_word_cross_out_text_shortcut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426830/normal_600a15118b1b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459645/normal_6001dbe13b844.pdfIn PDF document text
    • https://cdn.sqhk.co/megopofe/gd1n5jf/photo_tool_for_dv_lottery_not_working.pdfIn PDF document text
    • http://nitiwopororotef.mypressonline.com/which_graco_sprayer_to_buy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383704/normal_5fde1240524d6.pdfIn PDF document text
    • http://xugejujivekivu.iblogger.org/auto_sync_via_dropbox_android.pdfIn PDF document text
    • https://vejazejama.weebly.com/uploads/1/3/1/3/131381369/madobafa.pdfIn PDF document text
    • http://dasopifumos.iblogger.org/74949289475.pdfIn PDF document text
    • https://bazigumaxofiz.weebly.com/uploads/1/3/5/3/135383162/deac9ad2e848e.pdfIn PDF document text
    • https://radigaligoled.weebly.com/uploads/1/3/4/3/134333621/fokidulovisuko.pdfIn PDF document text
    • https://tuboxivodase.weebly.com/uploads/1/3/4/3/134387713/bojumibagilu.pdfIn PDF document text
    • https://cdn.sqhk.co/zewumirapeb/hgMKgdr/match_fun_3d_app.pdfIn PDF document text
    • https://zowomotoridaxa.weebly.com/uploads/1/3/1/4/131438570/xutuzozuw_livasonakutava.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://roxujewov.myartsonline.com/zadabonu.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001535f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1535F 5644 bytes
SHA-256: 2912129dd0224005fe9e22cd6594f2448fd041a1213dc05bbf184e77d7e53e74
font_01_sfnt_off0001666f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1666F 10708 bytes
SHA-256: 4cd0161580fd33664e5cf7b97d75b881c53065b7c7183c64725f3d8bb00452b9

Open this report in the interactive analyzer, or submit your own file for analysis.