Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ab9911f7cbcad8…

MALICIOUS

PDF

81.9 KB Created: 2021-03-16 07:38:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de0b52ef6586b4b0383e4dd3b7a52cd6 SHA-1: e44d98e90ac8f448ede8abfd9db8002ca1ee9636 SHA-256: 42ab9911f7cbcad88a027f37bc65a1f6d2889a0d1549e79d1935ef839674ccdc
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm with numerous external PDF links, suggesting it's designed to distribute further malicious content or phishing pages. The embedded URL `https://resalured.ru/wix?keyword=world+history+2+age+of+exploration+dbq+answers` appears to be a lure, likely leading to a malicious site or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/wix?keyword=world+history+2+age+of+exploration+dbq+answers
    • https://cdn.sqhk.co/xovikojux/gfWgiCY/vuzapijadij.pdf
    • https://static.s123-cdn-static.com/uploads/4403121/normal_5fee656feb5b4.pdf
    • https://cdn.sqhk.co/jivazufevi/gfhbHpB/93836383036.pdf
    • https://cdn-cms.f-static.net/uploads/4391015/normal_5fe789e17b755.pdf
    • https://cdn-cms.f-static.net/uploads/4456122/normal_6013c3754cc52.pdf
    • https://cdn-cms.f-static.net/uploads/4405946/normal_601c8896accdb.pdf
    • https://cdn-cms.f-static.net/uploads/4372378/normal_601954564ef62.pdf
    • https://static.s123-cdn-static.com/uploads/4401983/normal_5fcbdfca6c58d.pdf
    • https://cdn-cms.f-static.net/uploads/4392470/normal_5fd1e44550570.pdf
    • https://cdn-cms.f-static.net/uploads/4378834/normal_5fd9340aecd53.pdf
    • https://cdn.sqhk.co/kelopifagisu/iT0Gjbn/40471932683.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e0a971b2-7104-4718-9e5f-4f17d768618f.filesusr.com/ugd/6d43b6_1521929afa87452896cb5415af73a56e.pdf?index=true
    • http://nekepozime.epizy.com/how_to_connect_a_plantronics_bluetooth_headset_to_a_computer.pdf
    • http://dusameferadulo.onlinewebshop.net/taotao_scooter_repair_manual.pdf
    • https://27158da8-170d-48ca-a528-b8ced62fe517.filesusr.com/ugd/9fc8c3_b92d445ff838418486a2c8474abd347a.pdf?index=true
    • http://gununusaw.epizy.com/44682307111.pdf
    • http://xarinibobi.epizy.com/fuvetamexekobulinof.pdf
    • http://dovunufesesiz.onlinewebshop.net/xakoriwimelizegu.pdf
    • http://sibisewol.rf.gd/54010090205.pdf
    • http://lelofenejoziza.epizy.com/delarikopitolalupiru.pdf
    • https://198d5876-2e36-4a54-a59d-b4c1060b65be.filesusr.com/ugd/4733ca_789e660a22104a74a7c100784ae68c0a.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff0d.bin
1d96e99523ec2a0a74865bacfd884103df0bda5e7b0536898dfe93740b84bc60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0D 5976 bytes
font_01_sfnt_off00011377.bin
cf3293f36e80e1bd7428f77c87c2133045b7549e023a9c51ff9a171123d91bf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11377 11352 bytes

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