Malicious PDF — malware analysis report

Static analysis result for SHA-256 92e6ae1ab13934a3…

MALICIOUS

PDF

86.0 KB Created: 2021-01-09 17:41:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 060d250445872b77b43da443f81eb396 SHA-1: 2fc168c5a046c9d42cf08e469ac80f9df1e14dfa SHA-256: 92e6ae1ab13934a35ec2a460c4ae50a5f976ab2aaa9dae35b6438fe05cf3e391
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document that contains a large number of external links, many of which point to disposable hosting services. The ML classifier and ClamAV detection strongly indicate maliciousness. The primary URL, 'https://trafftec.ru/aws?utm_term=online+chess+app+free', suggests a lure for users interested in online chess applications, likely a phishing or scam attempt. The PDF's structure and numerous external links are indicative of a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • 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://trafftec.ru/aws?utm_term=online+chess+app+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367625/normal_5fdc7fe1be483.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386836/normal_5fa8637b8b64d.pdfIn PDF document text
    • https://bovuxugiz.weebly.com/uploads/1/3/4/9/134901291/moliso.pdfIn PDF document text
    • https://negiwonilelif.weebly.com/uploads/1/3/4/5/134583179/5891233d4105.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489033/normal_5fda1f68ebf21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445103/normal_5fa4ca591bf6f.pdfIn PDF document text
    • https://bofezukidev.weebly.com/uploads/1/3/4/4/134464138/katufabititedimeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482403/normal_5fc94143141c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454988/normal_5fbcd61edd51c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369638/normal_5f90967f66aa6.pdfIn PDF document text
    • https://lababober.weebly.com/uploads/1/3/5/3/135329518/81f95917.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fosagoba/mass_and_volume_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b27633ac-a9f7-4d58-90f3-a61a0b989309/.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b31cdff7-83e0-446e-95d6-2680920b263c/megatusurufovor.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/kalvisolai_10th_english_guide.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00012db2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12DB2 18176 bytes
SHA-256: 69d3bc24b76e75da3a16c5bf80338cd4116cb022753e321c400c1891db08f51d
font_00_sfnt_off0000eefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFA 5132 bytes
SHA-256: a2e7b8f1679fb798af52582cdf27ca82fe800db8b93c492c68f52bec673a738f
font_01_sfnt_off00010061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10061 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off000108ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EF 10844 bytes
SHA-256: 8468311b71b022cc5f733678d156ae66c58ecf4fe087305c9b4fb18755483859

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