Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea8666d49787d1a6…

MALICIOUS

PDF

90.9 KB Created: 2021-05-22 22:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0c1ff46ba4f18516de8ad90de21c9b53 SHA-1: cde6078bb2d075271769a8b77e51de17584b6874 SHA-256: ea8666d49787d1a6ab71ccef559a9a53eb1697bb11d2ff0d510bff251351a36d
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a link farm, likely intended to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it acts as a dropper or redirector, potentially leveraging embedded JavaScript for its malicious functions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=descargar+free+fire+para+android+mega+2020+windows PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4480182/normal_5fe0b7e7db328.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470038/normal_605415560e924.pdfIn PDF document text
    • https://noparageselex.weebly.com/uploads/1/3/1/8/131856757/fd1a5998c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387417/normal_6048a553c9862.pdfIn PDF document text
    • https://xoxoxiwozolem.weebly.com/uploads/1/3/0/7/130739626/sudapajolisus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498702/normal_605fff94ca509.pdfIn PDF document text
    • https://lupogupep.weebly.com/uploads/1/3/4/4/134444844/zusogilija-jijeledam-suzejewikeva-bidediwakeg.pdfIn PDF document text
    • https://saworajopasu.weebly.com/uploads/1/3/0/7/130775294/mukaxekit-govobosidit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426941/normal_605caafe4d717.pdfIn PDF document text
    • https://nuzukozifazo.weebly.com/uploads/1/3/2/6/132682871/2f5f08ba.pdfIn PDF document text
    • https://dafufiwe.weebly.com/uploads/1/3/4/3/134368649/zexopisoxaluzakevil.pdfIn PDF document text
    • https://puxorubawi.weebly.com/uploads/1/3/5/3/135349856/9063505.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411923/normal_60107b8e5abe6.pdfIn PDF document text
    • https://witomoniwitu.weebly.com/uploads/1/3/5/3/135317652/butanig.pdfIn PDF document text
    • https://gojojiwegojefuw.weebly.com/uploads/1/3/2/6/132695574/4384068.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529893/normal_605333c0593fb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gateme/3172889837.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/75892093425.pdfIn PDF document text
    • https://s3.amazonaws.com/kubedukowug/best_chain_for_stihl_ms_250.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/63381086532.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001136d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136D 5516 bytes
SHA-256: 9a0b22a13f5b61a30b95eaaef844718dc8596797d18bc425365ddb2f3dea550b
font_01_sfnt_off0001261d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261D 12296 bytes
SHA-256: 65cd3699fa4e31f4dc6fc1c6661b54250fecb3d1342473e9c32b8f6958850559
font_02_sfnt_off00014e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E28 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2